Annals of Occupational and Environmental Medicine

Original Article

Work-life balance and effort-reward imbalance, and their interaction, associated with presenteeism among Korean wage workers: Based on 6th Korean working conditions survey: Sang-Hyeon Kim, Eun-Chul Jang, Soon-Chan Kwon, In-ho Lee, Jisuk Yun, Ui Chan Jung, Young-Sun Min; Ann Occup Environ Med 2026;38:e1. Published online January 8, 2026; DOI: https://doi.org/10.35371/aoem.2026.38.e1

Abstract Abstract in Korean PDF Supplementary Material: Background
This study investigated the relationship between work-life balance (WLB), effort-reward imbalance (ERI), and presenteeism among Korean wageworkers through two models used simultaneously.
Methods
Data from the 6th Korean Working Conditions Survey for 28,669 Korean workers, including 13,513 men and 15,156 women, were analyzed. All analyses were performed with pre-designed weight. Multiple logistic regression analysis was used to analyze the association between WLB, ERI, and presenteeism among Korean workers. The participants were classified into the following four groups: group 1, status of both WLB and ERI is “balanced”; group 2, WLB and ERI status are “imbalanced” and “balanced”, respectively; group 3, WLB and ERI status are “balanced” and “imbalanced”, respectively; group 4: status of both WLB and ERI is “imbalanced.”
Results
We found that WLB and ERI were associated with presenteeism in both men and women. Depending on their WLB and ERI status, women generally had a higher tendency of presenteeism than men. Multiple logistic regression shows that, in most models and groups, there is an increased odds ratio (OR) for presenteeism in both men and women compared to the reference value. Moreover, the OR in both men and women gradually increased in groups 2, 3, and 4 compared with group 1. When considering both WLB and ERI status simultaneously, ERI had a greater impact on presenteeism than WLB. Furthermore, it was found that a synergistic effect of presenteeism manifests when both WLB and ERI are in a state of imbalance simultaneously.
Conclusions
Using the two models simultaneously, we found an association between WLB, ERI, and presenteeism according to sex with a synergistic effect among Korean workers. Our research suggests that active interventions targeting WLB and ERI are necessary to reduce presenteeism, which ultimately leads to decreased productivity.; 한국 임금근로자의 일과 삶의 균형, 노력-보상 불균형과 프리젠티즘의 관련성
배경
일-삶 균형 상태, 노력-보상 불균형 상태와 프리젠티즘과의 관계를 각각 다룬 여러 연구가 있었으나 이를 동시에 조사한 연구 결과는 제한적이다. 본 연구는 한국 임금근로자를 대상으로 일-삶-균형 상태, 노력-보상 불균형 상태를 동시에 고려하여 프리젠티즘의 관련성을 확인하고자 하였다.
방법
본 연구는 제 6차 근로환경조사를 활용하여 그 중 선별된 임금근로자 28,669명을 대상으로 자료를 수집하였다. 변수로 대상자의 일반적인 특성 및 교육수준, 수입수준, 사업장 규모, 교대근무 여부 등 직업적 특성이 포함되었다. 본 연구의 종속변수인 프리젠티즘은 그 여부에 따라 두가지 범주로 나누었다. 주요 독립변수인 일-삶의 균형, 노력-보상 불균형 상태는 ‘균형’, ‘불균형’ 두가지 범주로 나누어 평가하였다. 다중 로지스틱 회귀 분석은 남녀 각각에 대해 시행하였고, 일-삶 균형 상태, 노력-보상 불균형 상태와 프리젠티즘의 연관성을 평가하였다. 대표성 있는 도출을 위해 모든 통계분석에는 사전에 계산된 가중치를 적용하였다.
결과
일과 삶의 균형(WLB)과 노력-보상 불균형(ERI)이 남녀 모두에서 프리젠티즘과 연관되어 있음을 발견하였다. WLB 및 ERI 상태에 따라 여성은 일반적으로 남성보다 프리젠티즘 경향이 더 높았다. 다중 로지스틱 회귀 분석에 따르면, 대부분의 모델과 집단에서 기준 값 대비 남녀 모두 프리젠티즘의 오즈비가 증가했다. WLB와 ERI 상태를 동시에 고려할 때, ERI가 WLB보다 프리젠티즘에 더 큰 영향을 미치는 것으로 나타났다. 더불어 WLB와 ERI가 동시에 불균형 상태일 때 프리젠티즘의 시너지 효과가 나타남이 확인되었다.
결론
두 모델을 동시에 적용한 결과, 한국 근로자 집단에서 남녀 모두에서 일과 삶의 균형과 노력-보상 불균형이 충족되지 않을 경우 프리젠티즘이 나타나고 이는 시너지 효과가 나타남을 확인하였다. 본 연구는 궁극적으로 생산성 저하를 초래하는 프리젠티즘을 줄이기 위해서는 일과 삶의 균형과 노력-보상 불균형에 초점을 맞춘 적극적인 개입이 필요함을 시사한다.

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Original Article

Association between sudden work recall and psychological health issues: a cross-sectional analysis of the 6th Korean Working Conditions Survey: Dong-Woo Kim, June-Hee Lee, In-Ho Lee, Kyung-Jae Lee; Ann Occup Environ Med 2025;37:e33. Published online September 8, 2025; DOI: https://doi.org/10.35371/aoem.2025.37.e33

Abstract Abstract in Korean PDF: Background
The impact of global integration has led to an increase in non-standard work patterns, threatening workers' health. Psychological health problems, such as anxiety and fatigue, negatively affect workers' health and safety. Sudden work recall, a situation where workers are asked to return to work under unpredictable circumstances, is associated with uncertainty. Research on the relationship between sudden work recall and anxiety and fatigue is limited, and this study aims to investigate this relationship among Korean workers.
Methods
The study used data from the 6th Korean Working Conditions Survey. To analyze the pure effects of sudden work recall, the final sample was limited to 15,702 non-shift workers with a ‘good’ subjective health status. The presence of sudden work recall was categorized into three frequency groups: “several times a month,” “rarely,” and “never.” Anxiety and fatigue were each categorized into "yes" or "no" responses. Multiple logistic regression analysis was performed.
Results
After adjusting for demographic and occupational characteristics, the odds ratio (OR) for anxiety in the 'several times a month' group was 4.066 (95% confidence interval [CI]: 2.787–5.931), indicating a significantly higher risk. Conversely, the OR for the 'rarely' group was 1.363 (95% CI: 0.921–2.017), which was not statistically significant. A similar pattern was observed for fatigue: the 'several times a month' group had a significantly higher risk (OR: 1.875; 95% CI: 1.490–2.359), but the 'rarely' group (OR: 0.955; 95% CI: 0.750–1.215) did not.
Conclusions
The relationship between sudden work recall and psychological health may not be a simple linear one. The results suggest that only a high frequency of sudden work recall is associated with an increased risk of anxiety and fatigue. Therefore, it is necessary to establish appropriate measures and to conduct additional research in this area.; 돌발적 업무 복귀 요청과 심리적 건강 문제의 연관성: 제 6차 근로환경조사를 이용한 단면 분석
목적
세계화로 인한 비정형적 근무 형태의 증가는 노동자의 건강을 위협하고 있다. 특히 불안과 피로와 같은 심리적 건강 문제는 삶의 질과 안전에 부정적인 영향을 미친다. 본 연구는 예측 불가능한 상황에서 갑자기 업무에 복귀하라는 요청을 받는 ‘돌발적 업무 복귀 요청’이 한국 노동자의 불안 및 피로와 어떤 연관성을 가지는지 조사하고자 한다.
방법
본 연구는 제6차 근로환경조사 자료를 활용했으며, 돌발적 업무 복귀 요청의 순수한 영향을 분석하기 위해 교대 근무자와 주관적 건강 상태가 ‘보통’ 이하인 근로자를 제외한 총 15,702명을 최종 분석 대상으로 선정했다. 돌발적 업무 복귀 요청의 빈도에 따라 ‘없음’, ‘드물게’, ‘한 달에 여러 번’으로 범주를 나누었으며, 다중 로지스틱 회귀분석을 통해 돌발적 업무 복귀 요청과 불안 및 피로 간의 연관성을 분석했다.
결과
인구통계학적 및 직업적 특성을 보정한 후, ‘한 달에 여러 번’ 돌발적 업무 복귀를 경험한 그룹은 불안(OR: 4.066, 95% CI: 2.787–5.931)과 피로(OR: 1.875, 95% CI: 1.490–2.359)의 위험이 유의미하게 높았다. 반면, ‘드물게’ 경험한 그룹은 불안(OR: 1.363, 95% CI: 0.921–2.017)과 피로(OR: 0.955, 95% CI: 0.750–1.215) 모두에서 통계적으로 유의미한 연관성이 나타나지 않았다.
결론
돌발적 업무 복귀 요구와 불안 및 피로의 관계는 단순히 선형적이지 않으며, 높은 빈도로 경험할 때만 유의미한 위험 증가와 관련이 있음을 시사한다. 돌발적인 업무 복귀 요청이 신체적 및 정신적 장애를 유발할 수 있는 가능성에 대한 연구는 제한적이며, 이러한 문제를 예방하기 위한 대책이 충분히 발전되지 않았다. 따라서 돌발적 업무 복귀와 관련된 근로자 건강 보호 및 예측 가능한 근무 환경 조성 분야에서 적절한 대책을 수립하고 추가적인 연구를 수행할 필요가 있다.

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Original Article

Association between single-person household wage workers in South Korea and insomnia symptoms: the 6th Korean Working Conditions Survey (KWCS): Yoon Ho Lee, Yong-Jin Lee, Eun-Chul Jang, Young-Sun Min, Soon-Chan Kwon; Ann Occup Environ Med 2024;36:e25. Published online September 6, 2024; DOI: https://doi.org/10.35371/aoem.2024.36.e25

Abstract Abstract in Korean PDF

Background
The rise in single-person households is a global phenomenon with well-documented implications for both physical and mental well-being. However, there remains a scarcity of studies focusing specifically on the health impacts of single-person households on workers. This study aims to address this gap by comparing insomnia symptoms between single- and multi-person household workers, shedding light on the health implications of household composition.
Methods
This study utilized data from the Sixth Korean Working Conditions Survey. Insomnia symptoms were categorized into normal sleep and insomnia symptom groups utilizing the 3-item Minimal Insomnia Symptom Scale. Multiple logistic regression analysis was employed to examine the association between single-person household wage workers and insomnia symptoms.
Results
In comparison to wage workers from multi-person households, those from single-person households exhibited heightened risks of reporting insomnia symptoms. In the fully adjusted model, the odds ratios for symptoms of insomnia among single-person household wage workers was 1.173 (95% confidence interval: 1.020–1.349).
Conclusions
This study underscores that single-person household wage workers in Korea face an elevated risk of insomnia symptoms compared to their counterparts in multi-person households.

한국 1인 가구 임금근로자와 불면증 증상들의 연관성: 제6차 한국근로환경조사 (KWCS)
목적
기존 연구에 의하면 1인 가구와 건강 문제는 부정적인 연관성을 보이는 것으로 알려져 있으나 1인 가구 임금 근로자들에 대한 연구는 부족해 보인다. 이에 임금 근로자들을 대상으로 1인 가구의 불면증 증상의 실태를 파악하고 다인 가구 임금 근로자들과 비교하여 1인 가구 근로자가 건강에 어떠한 영향을 미치는지 연구해보고자 한다.
방법
이 연구는 제6차 근로환경조사의 원시자료를 이용한 단면 연구이다. 불면증 증상의 경우 Minimal Insomnia Symptom Scale (MISS)를 사용하여 평가되었다. 다인 가구 임금 근로자군과 비교했을 때 1인 가구 임금 근로자군과 불면증 증상 간의 연관성을 연구하기 위해 다중 로지스틱 회귀분석을 실시하였다.
결과
다인 가구 임금 근로자군과 비교했을 때 1인 가구 임금 근로자군의 불면증 증상에 대한 교차비(OR)은 1.173 (95% confidence interval [CI]: 1.020-1.349)로 나타났다.
결론
연구 결과 한국의 1인 가구 임금 근로자는 다인 가구 임금 근로자에 비해 불면증 증상을 보일 위험이 높은 것으로 나타났다. 1인 가구 근로자의 증가 추세는 근로자의 건강에 영향을 미치는 요인으로서 관심이 필요할 것으로 생각된다.

Citations

Citations to this article as recorded by

Influencing Factors of Quality of Life Among Korean Women in One-Person and Multiperson Households: Analysis of the 8th Korean National Health and Nutrition Examination Survey
Mi-Rae An, Seul-Gi Jeong, Ju-Hee Nho
Journal of Korean Maternal and Child Health.2025; 29(4): 228. CrossRef

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1 Crossref

Original Article

Association between lone work and self-rated health status: using the 5th Korean Working Conditions Survey: Eunseun Han, Ui-Jin Kim, Yongho Lee, Sanghyuk Lee, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang; Ann Occup Environ Med 2023;35:e29. Published online July 31, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e29

Abstract PDF Supplementary Material

Background

Lone workers are generally defined as individuals who work alone without supervision, including self-employed people. While lone workers are considered a vulnerable group in some countries, there is a lack of research on their health status in domestic studies. Globally, the number of lone workers has been increasing, and this trend has been further accelerated since the coronavirus disease 2019 (COVID-19) pandemic with the rise of remote work.

Methods

The study analyzed data from 44,281 participants, excluding unpaid family workers, soldiers, and those with missing data. Lone workers were defined as individuals who reported having no colleagues with the same job at their current workplace. Self-rated health status was categorized as “good” or “poor.”

Results

This study found a statistically significant higher number of lone workers among women compare to men. The largest occupational category for lone workers was service and sales workers, followed by agriculture and fisheries workers. A majority of non-lone workers reported working 40 hours or less per week, while the majority of lone workers reported working 53 hours or more per week. In addition, lone workers had significantly poorer health status evaluations compared to non-lone workers (odds ratio: 1.297; 95% confidence interval: 1.165–1.444).

Conclusions

Further research is needed to investigate the causal relationship between lone work and health, using data collected after the COVID-19 pandemic.

Citations

Citations to this article as recorded by

Workplace support, wellbeing and intention to leave among lone working healthcare assistants providing palliative and end-of-life care in the community: A mixed methods study
Katarzyna A. Patynowska, Emma Maun, Erin Raquel Fantoni, Tracey McConnell, Anne Finucane, Jonathan Clemo, Epiphany Leone, Natasha Wynne, Colette McAtamney, Felicity Hasson
Palliative Medicine.2026; 40(2): 194. CrossRef
Association between occupational exposure, musculoskeletal disorders, occupational depression, and workplace violence in Korean workers: a nationwide large-scale study
Shiva Raj Acharya, Jeevan Bhatta, Rajitha Kawshalya Mailan Arachchige Don
Global Health Journal.2026;[Epub] CrossRef
Association Between Precarious Employment and Cognitive Decline: A Longitudinal Study of Middle-Aged and Older Workers in Korea
Seong-Uk Baek, Jin-Ha Yoon
Journal of General Internal Medicine.2025; 40(10): 2292. CrossRef
Impact of Changes in Type of Employment on Absenteeism/Presenteeism Among Korean Workers
Yunjun Park, Wanhyung Lee
Journal of Occupational & Environmental Medicine.2025; 67(11): e807. CrossRef
Association between single-person household wage workers in South Korea and insomnia symptoms: the 6th Korean Working Conditions Survey (KWCS)
Yoon Ho Lee, Yong-Jin Lee, Eun-Chul Jang, Young-Sun Min, Soon-Chan Kwon
Ann Occup Environ Med.2024; 36: e25. CrossRef

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5 Crossref

Original Article

Incidence rates of injury, musculoskeletal, skin, pulmonary and chronic diseases among construction workers by classification of occupations in South Korea: a 1,027 subject-based cohort of the Korean Construction Worker’s Cohort (KCWC): Seungho Lee, Yoon-Ji Kim, Youngki Kim, Dongmug Kang, Seung Chan Kim, Se-Yeong Kim; Ann Occup Environ Med 2023;35:e26. Published online July 24, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e26

Abstract Abstract in Korean PDF Supplementary Material

Background

The objective of this study is to investigate the differences in incidence rates of targeted diseases by classification of occupations among construction workers in Korea.

Methods

In a subject-based cohort of the Korean Construction Worker’s Cohort, we surveyed a total of 1,027 construction workers. As occupational exposure, the classification of occupations was developed using two axes: construction business and job type. To analyze disease incidence, we linked survey data with National Health Insurance Service data. Eleven target disease categories with high prevalence or estimated work-relatedness among construction workers were evaluated in our study. The average incidence rates were calculated as cases per 1,000 person-years (PY).

Results

Injury, poisoning, and certain other consequences of external causes had the highest incidence rate of 344.08 per 1,000 PY, followed by disease of the musculoskeletal system and connective tissue for 208.64 and diseases of the skin and subcutaneous tissue for 197.87 in our cohort. We especially found that chronic obstructive pulmonary disease was more common in construction painters, civil engineering welders, and civil engineering frame mold carpenters, asthma in construction painters, landscape, and construction water proofers, interstitial lung diseases in construction water proofers.

Conclusions

This is the first study to systematically classify complex construction occupations in order to analyze occupational diseases in Korean construction workers. There were differences in disease incidences among construction workers based on the classification of occupations. It is necessary to develop customized occupational safety and health policies for high-risk occupations for each disease in the construction industry.

한국 건설업 종사자의 손상, 근골격계 질환, 피부, 호흡기 및 만성질환의 건설 직종에 따른 발생률: 한국 건설업 종사자 코호트(KCWC) 의 1027명 대상자 기반 세부 코호트 분석
목적
본 연구의 목적은 한국 건설업 종사자에 있어 주요 질환의 건설 직종별 발생률 차이를 알아보는 것이다.
방법
한국 건설업 종사자 코호트(KCWC)의 대상자 기반 세부 코호트로 총 1,027명의 건설업 종사자가 1:1면접설문조사를 통해 입적되었다. 직업적 노출요인으로 직종은 크게 건설산업환경과 직무 두 가지 축으로 분류되었다: 직업적 노출(설문조사) 자료와 국민건강보험공단 청구 맞춤형 자료를 연계하여 질환의 평균 발생률을 분석하였다. 주요 질환은 건설업 종사자에서 유병률이 높거나 업무 관련성이 있을 것으로 추정되는 11개의 대상 질환을 평가하였다. 질환별 평균 발생률은 1,000인년당 발병 사례수(명)으로 계산하였다.
결과
손상, 중독 및 외인에 의한 특정 기타 결과가 1,000인년당 344.08명으로 가장 높은 발생률을 보였고, 그 다음으로 근골격계 및 결체조직의 질환이 1,000인년당 208.64명, 피부 및 피하조직 질환이 1,000인녕당 197.87명 순으로 높았다. 특히, 만성 폐쇄성 폐질환이 건축 도장공, 토목 용접공, 토목 형틀목공에서 타 직종에 비해 상대적으로 높은 발생률을 보였고, 천식은 건축 도장공, 조경, 건축 방수공에서, 간질성 폐질환은 건축 방수공에서 상대적으로 높은 발생률을 보였다.
결론
본 연구는 한국 건설업 종사자의 주요 직업성 질환 및 호발 질환 등을 복잡한 건설산업의 직종을 체계적으로 분류하여 분석한 최초의 연구로 연구진들은 건설업 종사자의 질환별 발생률에 있어 직종별 차이를 확인하였다. 건설 산업에서 각 질환별 고위험 직종별로 맞춤형 산업안전보건정책 개발이 필요하다.

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The Ewha Medical Journal.2025;[Epub] CrossRef
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Original Article

The relationship between shift work pattern and thyroid stimulating hormone in female workers: Hun Jeong, Chang Ho Chae, Jun Ho Lee, Hyo Won Chong; Ann Occup Environ Med 2023;35:e14. Published online June 22, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e14

Abstract Abstract in Korean PDF

Background

Shift work is known to cause changes in the circadian rhythm of the human body and adversely affect not only physical health but also mental health. Some studies have demonstrated the correlation between shift work and thyroid stimulating hormone (TSH), a hormone that changes according to the diurnal rhythm, but few studies have reported the different TSH levels according to the shift work type. This study aimed to investigate changes in TSH according to the shift work type.

Methods

This study included 1,318 female workers who had a medical checkup at a university hospital in Changwon from 2015 to 2019. Shift work types were classified as non-shift work, regular 2 shifts, and irregular three shifts, and a TSH ≥ 4.2 mIU/L was defined as abnormal. A general linear model (GLM) was used to compare the TSH levels and the risk of subclinical hypothyroidism in each year, and a binary logistic analysis was performed using a generalized estimation equation (GEE) to compare the risk of subclinical hypothyroidism over the 5-year period.

Results

Of the 1,318 participants included in this study, 363, 711, and 244 were non-shift, two-shift, and irregular three-shift workers, respectively. In the GEE analysis, after adjusting for age, body mass index, smoking, and alcohol consumption, the odds ratios (ORs) were 1.81 (95% confidence interval [CI]: 1.15–2.86; p = 0.011) in 2 shifts and 2.02 (95% CI: 1.23–3.32; p = 0.006) in irregular three shifts, compared to non-shift.

Conclusions

Our results showed that shift work had a higher risk of subclinical hypothyroidism than non-shift work and that there was a significant difference in the risk of subclinical hypothyroidism according to the shift work type. These findings suggest that the shift work type can be considered in future thyroid function tests and evaluations.

여성근로자에서 교대근무유형과 갑상선 자극 호르몬과의 연관성
목적
교대근무는 인체의 일중리듬에 변화를 일으키고 심혈관 질환, 소화기 질환 및 대사증후군과 같은 신체적 건강 뿐만 아니라 수면장애, 우울감 등을 포함한 정신건강에도 유해한 영향을 끼치는 것으로 알려져 있다. 일중리듬에 의해 변화하는 호르몬 중 하나인 갑상선 자극 호르몬(TSH)의 농도가 교대근무와의 연관성을 보여주는 연구들이 있으나 교대근무 유형에 따른 차이를 살펴본 연구는 부족한 실정이다. 본 연구는 교대근무의 유형에 따른 TSH의 변화를 알아보고자 하였다.
방법
2015년부터 2019년까지 창원의 일개 대학병원의 건강진단을 받은 1,318명의 여성근로자를 대상으로 연구를 진행하였다. 교대근무유형은 비교대근무, 규칙적 2교대 및 불규칙 3교대로 분류하였으며 TSH ≥ 4.2mIU/L인 경우 이상이 있는 것으로 정의하였다. 연도별로 TSH의 농도를 비교하기 위하여 일반선형모델을 사용하였으며 5년간의 불현성 갑상선기능저하증의 위험도를 비교하기 위하여 일반화추정방정식을 사용하여 이분형 로지스틱 분석을 시행하였다.
결과
연구 대상자 1,318명 중 비교대근무자는 총 363명, 2교대 근무자는 총 711명, 불규칙 3교대 근무자는 총 244명이었다. 연령, 체질량지수(BMI), 흡연, 음주를 보정하고 일반화추정방정식을 사용하여 이분형 로지스틱 분석을 시행한 결과, 비교대근무자를 기준으로 하였을 때, OR은 2교대 근무자에서 1.81(95% CI 1.15-2.86, P=0.011), 불규칙 3교대 근무자에서 2.02(95% CI 1.23-3.32, P=0.006)로 나왔다.
결론
본 연구의 결과는 교대근무가 비교대근무에 비해 불현성 갑상선기능저하증의 위험도가 높았으며 교대근무의 유형에 따른 불현성 갑상선기능저하증의 위험도에 있어 유의미한 차이를 보였다. 이는 이전 연구들의 결과를 뒷받침할 뿐만 아니라 향후 갑상선 기능 검사 및 평가에 있어 교대근무의 유형이 고려대상이 될 수 있을 것으로 생각된다.

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Environmental Research.2025; 276: 121503. CrossRef
Association between shift work and levels of thyroid hormones and interleukin-37
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Case Report

Occupational asthma related to indoor air pollution in a worker at an indoor air gun shooting range: a case report: Kwang Min Lee, Seungho Lee, Yoon-Ji Kim, Seung-eun Lee, Youngki Kim, Dongmug Kang, Se-Yeong Kim; Ann Occup Environ Med 2023;35:e13. Published online June 19, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e13

Abstract Abstract in Korean PDF Supplementary Material

Background

Indoor air pollution can cause and exacerbate asthma. We report a previously undescribed case of occupational asthma related to indoor air pollution in a worker at an indoor air gun shooting range and highlight the potential risk of developing occupational asthma in this environment.

Case presentation

A 31-year-old man presented with dyspnea, cough, and sputum and was diagnosed with asthma complicated by pneumonia. Objective evidence of asthma was obtained by performing a methacholine bronchial provocation test. It was suspected that the patient had occupational asthma, which began one month after changing jobs to work within the indoor air gun shooting range. The highest peak expiratory flow (PEF) diurnal variability on working days was 15%, but the highest variation was 24%, with 4 days out of 4 weeks having a variation of over 20% related to workplace exposure. Conversely, the diurnal variability on the rest days was 7%, and no day showed a variation exceeding 20%. The difference in the average PEF between working and rest days was 52 L/min. PEF deterioration during working days and improvement on rest days were noted.

Conclusions

The results obtained from the in-depth analysis of the PEF were adequate to diagnose the patient with occupational asthma. Exposure to indoor air pollution and lead and the patient’s atopy and allergic rhinitis may have contributed to the development of occupational asthma.

실내 공기총 사격장 근로자의 실내공기오염관련 직업성 천식 증례보고
a배경: 실내공기오염은 천식을 유발하고 악화시킬 수 있다. 본 연구는 실내 공기총 사격장에서 일하는 근로자의 실내 공기 오염과 관련된 이전에 기술되지 않은 직업성 천식 사례를 보고하고, 이러한 환경에서 직업성 천식 발병의 잠재적 위험을 강조한다.
증례
31세 남자가 호흡곤란, 기침, 가래 증상이 나타나 내원하였고, 폐렴이 동반된 천식으로 진단되었다. 천식의 객관적인 증거는 메타콜린 기관지유발검사를 시행하여 획득하였다. 환자는 실내공기총 사격장에서 근무하기 위해 이직한지 한달만에 직업성 천식을 앓고 있는 것으로 의심되었다. 근무일의 최고호기유량(PEF) 주간 변동성은 15%였지만, 가장 높은 변동성은 24%였으며, 4주 중 4일은 작업장 노출과 관련하여 20% 이상의 변동성을 보였다. 반대로 쉬는 날의 일교차는 7%로 20%를 넘는 날은 없었다. 근무일과 휴식일 사이의 평균 최고호기유량(PEF) 차이는 52 L/min이었다. 근무일 동안 PEF 악화 및 휴식일의 개선이 주목되었다.
결론
최고호기유량(PEF)의 심층분석결과는 직업성 천식 환자를 진단하기에 적합하였다. 실내공기오염과 납 노출, 환자의 아토피와 알레르기성 비염이 직업성 천식 발병에 기여했을 가능성이 있다.

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Original Article

Relationship between job stress and impaired fasting glucose in male steel industry workers: a cross-sectional study: Hyun-Kyo Lee, Inho Lee, Jisuk Yun, Yong-Jin Lee, Eun-Chul Jang, Young-Sun Min, Soon-Chan Kwon; Ann Occup Environ Med 2023;35:e12. Published online June 2, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e12

Abstract Abstract in Korean PDF

Background

The purpose of this study is to investigate the relationship between job stress and impaired fasting glycemia (IFG) of male workers in a manufacturing industry.

Methods

Data were collected from 5,886 male workers in a manufacturing industry who participated in the medical examination from June 19 to August 14, 2020 through self-reported questionnaires. The general characteristics of the subjects, shift work, high blood pressure, dyslipidemia, and job stress were included. Job stress was measured using the Korean Occupational Stress Scale (KOSS) consisting of 8 items and 43 questions. Multivariable logistic regression analysis was used to investigate the IFG association with job stress.

Results

Among the various factors that can cause job stress, only high job demand was associated with a risk of IFG (odds ratio, 1.43; 95% confidence interval, 1.13–1.82) especially in non-shift worker. For all other factors, no statistically significant results were obtained.

Conclusions

In this study of male workers engaged in the Korean steel manufacturing industry, the 'job demand' item among job stress of non-shift worker was related to IFG.

철강 공장에 근무하는 남성 근로자의 직무 스트레스와 공복혈당장애와의 관계: 단면연구
목적
제2형 당뇨와 직무 스트레스와의 관계를 다룬 여러 연구가 있었으나 공복혈당장애와의 관계를 조사한 연구 결과는 존재하지 않았다. 본 연구는 단일 철강 사업장에서 직무스트레스와 공복혈당장애의 관련성을 확인하되 한국형 직무스트레스 각각 항목과의 연관성을 파악하고자 하였다.
방법
2020년 6월 19일부터 8월 14일까지 건강검진에 참여한 제조업 남성 근로자 5,886명을 대상으로 자체 보고 설문지를 통해 자료를 수집하였다. 변수로 대상자의 일반적인 특성 및 교대근무, 재직년수, 고혈압, 이상지질혈증, 직무스트레스 점수가 포함되었다. 직무스트레스는 8개 항목과 43개 질문으로 구성된 한국직업스트레스척도(KOSS)를 이용하여 측정되었다. 다중 로지스틱 회귀 분석을 사용하여 직무 스트레스와 IFG의 연관성을 조사하였다.
결과
직무스트레스를 유발할 수 있는 다양한 요인 중, 비 야간작업자의 높은 직무요구도만이 IFG(OR 1.43, 95% CI 1.13-1.82)의 위험 증가와 관련이 있었다. 다른 모든 요인의 경우 통계적으로 유의한 결과가 얻어지지 않았다.
결론
철강 제조업에 종사하는 남성 근로자들을 대상으로 한 본 연구에서 직무 스트레스 중 ‘직무 요구’ 항목은 비 야간작업자의 공복혈당장애와 관련이 있었다. 향후 다양한 직업군을 대상으로 한 후속 연구가 필요할 것이다.

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Original Article

The health effects of low blood lead level in oxidative stress as a marker, serum gamma-glutamyl transpeptidase level, in male steelworkers: Su-Yeon Lee, Yong-Jin Lee, Young-Sun Min, Eun-Chul Jang, Soon-Chan Kwon, Inho Lee; Ann Occup Environ Med 2022;34:e34. Published online November 2, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e34

Abstract Abstract in Korean PDF

Background

This study aimed to investigate the association between lead exposure and serum gamma-glutamyl transpeptidase (γGT) levels as an oxidative stress marker in male steelworkers.

Methods

Data were collected during the annual health examination of workers in 2020. A total of 1,654 steelworkers were selected, and the variables for adjustment included the workers’ general characteristics, lifestyle, and occupational characteristics. The association between the blood lead level (BLL) and serum γGT level was investigated by multiple linear and logistic regression analyses. The BLL and serum γGT values that were transformed into natural logarithms were used in multiple linear regression analysis, and the tertile of BLL was used in logistic regression analysis.

Results

The geometric mean of the participants’ BLLs and serum γGT level was 1.36 μg/dL and 27.72 IU/L, respectively. Their BLLs differed depending on age, body mass index (BMI), smoking status, drinking status, shift work, and working period, while their serum γGT levels differed depending on age, BMI, smoking status, drinking status, physical activity, and working period. In multiple linear regression analysis, the difference in models 1, 2, and 3 was significant, obtaining 0.326, 0.176, and 0.172 (all: p < 0.001), respectively. In the multiple linear regression analysis stratified according to drinking status, BMI, and age, BLLs were positively associated with serum γGT levels. Regarding the logistic regression analysis, the odds ratio of the third BLL tertile in models 1, 2, and 3 (for having an elevated serum γGT level within the first tertile reference) was 2.74, 1.83, and 1.81, respectively.

Conclusions

BLL was positively associated with serum γGT levels in male steelworkers even at low lead concentrations (< 5 μg/dL).

제철소 남성근로자들의 저농도 납노출이 산화스트레스 지표인 혈청 감마지티에 미치는 건강영향
목적
본 연구의 목적은 일개 제철소에 근무하는 남성 근로자들의 납 노출 수준과 산화스트레스 지표로서의 혈청 감마지티와의 연관성을 확인하는 것이다.
방법
본 연구는 2020년 시행된 근로자 건강검진 자료를 이용하였으며, 총 1,654명의 남성 근로자가 최종 연구대상으로 선정되었다. 일반적 특성, 생활양식 및 직업적 특성을 나타내는 변수를 설정하여 보정하였으며, 혈중납수준과 혈청 감마지티의 연관성을 알아보기 위해 다중선형회귀분석 및 로지스틱회귀분석을 실시하였다. 다중선형회귀분석에서는 자연로그로 변환된 혈중납 및 혈청 감마지티값을, 로지스틱회귀분석에서는 혈중납 3분위수를 이용하였다.
결과
연구대상자의 혈중납 및 혈청 감마지티의 기하평균은 각각 1.36 μg/dL, 27.72 IU/L 이었으며, 혈중납수준은 연령, 체질량지수, 흡연, 음주, 교대근무, 근무기간에 따라 차이가 있었고, 혈청 감마지티는 연령, 체질량지수, 흡연, 음주, 신체활동, 근무기간에 따라 차이를 보였다. 다중선형회귀분석에서는 모형 1,2,3 에서 혈중납수준과 혈청감마티지의 유의미한 연관성을 보여주었으며 (Model 1, β : 0.326, p < 0.001 ;Model 2, β: 0.176, p< 0.001;Model 3, β: 0.172 p< 0.001), 음주상태, 연령, 체질량지수, 음주 및 흡연 통합변수로 층화하여 분석하였을 때에도 혈중납수준과 혈청감마지티의 연관성은 유의하였다. 로지스틱회귀분석은 혈중납 3분위수와 혈청 감마지티 상승위험의 연관성을 보여주었다. (Model 1, OR: 2.74, 95% CI: 1.764.28 ;Model 2, OR: 1.83, 95%CI:1.132.95 ; Model 3, OR 1.81, 95%CI:1.122.92)
결론
일개 제철소 남성근로자를 대상으로 실시된 본 연구는 혈중납 5μg/dL 이하의 저농도 노출수준에서도 혈중납 수준과 혈청 감마지티 수치가 연관성이 있음을 보여준다.

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Occupational Lead Exposure Among Civilian Indoor Shooting Range Workers in Korea: A Report of Blood Lead Levels and Airborne Lead
Sungjin Park, Jaeyoung Park, Bumjoon Lee, Yi-Ryoung Lee, Jiho Kim, Younmo Cho, Hyeongyeong Choi, Kyeongyeon Kim
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Association Between Low-Level Lead Exposure and Serum Gamma-Glutamyl Transferase Concentrations as a Biomarker of Oxidative Stress in U.S. Adolescents Aged 12–19 Years
Wenping Hu, Tanya T. LeBlanc, Audrey F. Pennington, Cheryl R. Cornwell, Paul B. Allwood
International Journal of Environmental Research and Public Health.2025; 23(1): 28. CrossRef
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Junwei Wang, Cunming Zhang, Aiwei Zhang
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Journal of Korean Medical Science.2023;[Epub] CrossRef

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Special Article

Approval status and characteristics of work-related musculoskeletal disorders among Korean workers in 2020: Eun-woo Cha, Sae-mi Jung, Il-ho Lee, Dae Hwan Kim, Eui Hyek Choi, In-ah Kim, Yong-kyu Kim, Kyung-joon Lee, Yang Won Kang, Ho-gil Kim, Young-ki Kim; Ann Occup Environ Med 2022;34:e31. Published online October 26, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e31

Abstract Abstract in Korean PDF

Background

This study aimed to investigate the characteristics of work-related musculoskeletal disorders (WRMSDs) in occupational disease claims and identify patterns of WRMSDs for each body part by industry and occupation.

Methods

This study analyzed the raw data of occupational disease claims for musculoskeletal disorders deliberated by the Occupational Disease Decision Committee of the Korea Workers’ Compensation & Welfare Service in 2020. The data was classified into 6 body parts with the highest numbers of occupational disease cases by using the complete enumeration data on principal diagnoses and 4 types of subdiagnoses in the raw data. The characteristics and approval rates of WRMSDs by body part, industry and occupation were examined and summarized.

Results

A total of 13,015 occupational disease cases for WRMSDs were classified, and lumbar spinal (back) diseases accounted for the largest proportion of claimed diseases, followed by shoulder, elbow, wrist, knee, and neck diseases in a descending order. The occupations with the highest and second highest numbers of occupational disease cases by body part were found to be automobile assemblers and production-related elementary workers for the neck, school meal service workers and cooks for the back, construction frame mold carpenters and school meal service workers for the shoulder, elementary workers in mining and food service workers for the elbow, food service workers and automobile parts assemblers for the wrist, and ship welders and school meal service workers for the knee.

Conclusions

This study examined the characteristics and approval status of WRMSDs by body part and occupation. Based on the study results, management strategies for the prevention of WRMSDs should be established regarding occupations with a high risk of WRMSDs for each body part.

업무상 근골격계질환의 2020년 산업재해 승인 현황과 특성
목적
본 연구는 업무 관련 근골격계 질환(WMSD)의 특성과 신체 부위에 따른 업종 및 직종별 WMSD 승인율을 분석하기 위해 실시됐다.
방법
2020년 근로복지공단 업무상질병판정위원회에서 심의된 근골격계질환 신청건의 원자료를 활용하여 분석하였다. 원자료의 주상병과 네가지 부상병 정보 전수를 활용하여, 상병신청건수가 많은 6개의 신체부위로 구분하였다. 각 부위별로 업종 및 직종에 대하여 특성과 승인율을 정리 하였다.
결과
WMSD 신청건수는는 총 13015건이 분류되었고, 이중 요추질환이 가장많았고, 어깨, 팔, 손목, 무릎, 경추 순으로 이어졌다. 부위별로 신청건수가 많았던 직종으로 경추는 자동차조립, 제조관련단순종사원, 요추는 급식조리사, 조리사, 어깨는 건설형틀목공, 급식조리사, 팔은 광업단순종사원, 급식조리사, 손목은 급식조리사, 자동차부품조립, 무릎은 조선용접공, 급식조리사로 조사됐다.
결론
신체 부위별 직종에 따른 WMSD의 특성 및 승인율 등을 살펴보았다. 이러한 결과를 바탕으로 신체 부위별 고위험 직종에 대하여 WMSD 예방을 위한 관리 전략이 수립되어야 한다.

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Synergy and Attenuation of Work-Related Factors in Musculoskeletal Disorders: The Combined Risk Based on Data from the Korean Working Conditions Survey
Eun-Soo Lee, Myong-Hwan Kim, Dongmug Kang, Youn-Hyang Lee, Yoon-Ji Kim, Se-Yeong Kim, Youngki Kim
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Self-Esteem Trajectories After Occupational Injuries and Diseases and Their Relation to Changes in Subjective Health: Result From the Panel Study of Workers’ Compensation Insurance (PSWCI)
Seong-Uk Baek, Won-Tae Lee, Min-Seok Kim, Myeong-Hun Lim, Jin-Ha Yoon, Jong-Uk Won
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Special Article

Standards for recognition and approval rate of occupational cerebro-cardiovascular diseases in Korea: Ui-Jin Kim, Won-Jun Choi, Seong-Kyu Kang, Wanhyung Lee, Seunghon Ham, Junhyeong Lee, Yongho Lee, Eunseun Han, Sanghyuk Lee, Yongkyu Kim, Inah Kim; Ann Occup Environ Med 2022;34:e30. Published online October 25, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e30

Abstract Abstract in Korean PDF Supplementary Material

Background

Although working hours have decreased in Korea, they are still high compared to that of other countries. In Korea, cardiovascular and cerebrovascular diseases (CCVDs) related to overwork in Korea continually occur, and the social burden from overwork is estimated to be high. This study investigated the amendment of regulations affecting the approval rate of occupational CCVDs.

Methods

The change in approval rate of occupational CCVDs and related regulations were investigated using the Act and public notice on the standards for recognition of occupational CCVDs and the yearbooks of the Ministry of Employment and Labor. The CCVD mortality was estimated using data on the number of deaths according to the cause of death, the number of employed people, and resident registration population aged 15–64 years. The cumulative mortality of CCVDs was estimated using the Kaplan-Meier method.

Results

Since the establishment of the standards for recognition in Korea in 1982, the scope of occupational diseases has been expanded to include intracerebral hemorrhage, subarachnoid hemorrhage, cerebral infarction, myocardial infarction, and aortic dissection. In 2013, the concept of working hours was introduced in chronic overwork. The approval rate of occupational CCVDs was 44.7% in 2006, which decreased to 12.9% in 2011. After the improvement of related regulations, the approval rate increased to 41.3% in 2018. From 2000 to 2017, the CCVD mortality of both the unemployed and employed tended to decrease, and their cumulative CCVD mortalities were 549.3 and 319.7 per 100,000 people, respectively.

Conclusions

CCVDs are recognized as occupational diseases in Korea. The amendments to the standards for recognition, the introduction of the Occupational Disease Adjudication Committee, the principle of presumption, and the reduction of working hours have changed the approval rate of occupational CCVDs. A strategic approach is needed to further reduce the incidence of CCVDs.

한국의 직업성 뇌심혈관계 질환에 대한 연구
목적
근로기준법 개정 적용 사업장 확대로 우리나라의 근무시간은 지속적으로 감소 추세에 있으나 타 국가에 비하면 여전히 높은 수준이다. 우리나라의 과로 관련 뇌심혈관계 질환은 지속적으로 나타나고 있으며 과로로 인한 사회적 부담이 클 것으로 추정된다. 이번 연구에서는 우리나라 뇌심혈관계 질환의 업무상 질병 승인율 변화 및 관련된 제도의 변화를 요약하고자 하였다.
방법
뇌심혈관계 질환 업무상 질병 인정기준에 관한 법령 및 고시와 고용노동부 사업연보를 통해 뇌심혈관계 질환 산재 승인율 변화 및 관련 규정을 조사하였다. 국가통계포털의 사망 원인, 취업자 수 및 주민등록인구 자료를 사용하여 우리나라의 뇌심혈관계 질환 사망자수, 사망률을 조사하고 Kaplan-Meier 방법을 통해 누적사망률을 산출하였다.
결과
1982년 우리나라에서 뇌졸중과 급성심장사에 대한 업무상 질병 인정기준이 제정된 이후 수차례 개정을 거쳐 인정 대상 질병 범위가 뇌실질내출혈, 지주막하출혈, 뇌경색, 심근경색증, 해리성대동맥류로 확대되었다. 2013년 만성과로 인정기준에 근무시간 개념이 도입되었다. 뇌심혈관계 질환 업무상 질병 승인율은 2006년 44.7%였다가 2011년 12.9%건까지 감소하였다. 제도적인 개선 후 승인율은 2018년 41.3%까지 증가하였다. 2000년부터 2017년까지 뇌심혈관계 질환 사망률은 미취업자 및 취업자 모두에서 감소하는 경향을 보였으며 이 기간 동안 미취업자 및 취업자의 뇌심혈관계 질환 누적사망률은 각각 10만 명당 549.3명 및 319.7명이었다.
결론
우리나라는 뇌심혈관계 질환을 업무상 질병으로 받아들이고 있다. 뇌심혈관계 질환 업무상 질병 승인율은 업무상 질병 인정기준 개정, 업무상질병판정위원회 제도 도입, 추정의 원칙 도입 및 평균 근무시간 감소 등에 의해서 변동되었다. 뇌심혈관계 질환은 그 경제적 부담이 크고 예방 가능한 질환으로 지속적인 예방 사업 등 발병 예방을 위한 전략적 접근이 필요하다.

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List of occupational diseases among farmers in Korea: a literature review
Hansoo Song, Seok-Ju Yoo, Won-Ju Park, Seunghyeon Cho, Ki Soo Park, Joo Hyun Sung, Sang Jin Park, Seong-yong Yoon, Kyeongsoo Kim, Dong-phil Choi, Hye-min Kim, Bounggyun Ju, Kanwoo Youn
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Journal of Korean Medical Science.2023;[Epub] CrossRef

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Original Article

The acclimatization of Haenyeo to a cold environment and occupational characteristics evaluated by orexin and irisin levels: Inho Lee, Yong-Jin Lee, Eun-Chul Jang, Soon-Chan Kwon, Young-Sun Min, Jisuk Yun, Taehwan Park, Hye-Jin Lee, Eonah Choo, Jeong-Beom Lee; Ann Occup Environ Med 2022;34:e28. Published online October 13, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e28

Abstract Abstract in Korean PDF

Background

Haenyeo is a woman who has the job of collecting seafood in the Jeju Sea at an average temperature of 13°C–14°C. The purpose of this study was to examine the cold acclimatization and occupational characteristics of Haenyeo through biomarkers such as orexin and irisin related to heat generation in the body.

Methods

Twenty-one Haenyeo and 25 people with similar age, body type, and body mass index were selected as the control group (Control G). In the cold exposure experiment, a climate chamber was set to 5°C and both feet were immersed in a 15°C water tank for 30 minutes. Tympanic temperature (T_ty) and skin temperature (T_sk) were measured, and the mean body temperature (mT_b) was calculated. Blood samples were collected before and immediately after the examination. Orexin and irisin levels were analyzed.

Results

Orexin levels were elevated after cold stimulation from 12.17 ± 4.44 to 12.95 ± 4.53 ng/mL (Haenyeo group [Haenyeo G], p < 0.01) and 10.37 ± 3.84 to 11.25 ± 4.02 ng/mL (Control G, p < 0.001). Irisin levels were elevated after cold stimulation from 4.83 ± 2.28 to 5.36 ± 2.23 ng/mL (Haenyeo G, p < 0.001) and 3.73 ± 1.59 to 4.18 ± 2.04 ng/mL (Control G, p < 0.001). The difference between Haenyeo G and Control G values in orexin and irisin appears not only in pre-exposure but also in post-exposure (p < 0.05).

Conclusions

Our experimental results suggest that Haenyeo G were relatively superior in cold tolerance to Control G under cold exposure conditions. Haenyeo’s cold acclimatization is due to the basic differences in pyrogens regarding body temperature control such as orexin and irisin. This means that Haenyeo are advantageous for cold survival.

해녀의 혈중 오렉신 및 이리신 수치를 통한 한랭환경 적응 및 직업적 특성에 관한 연구
목적
해녀는 산소공급장치 없이 바다에서 해산물을 채취하는 직업을 가진 여성으로 2016년 유네스코 인류무형문화유산에 '제주 해녀문화'로 등재됐다. 해녀 여성들은 제주 바다에서 평균 13~14°C의 온도에서 일하며 오랜 세월 동안 추운 환경 적응과 기후 적응의 환경 생리 반응을 발달시켰다. 본 연구의 목적은 체내 발열과 관련된 오렉신, 이리신 등의 생체지표를 통해 한랭적응시 체온유지에 사용되는 해녀의 한랭적응 및 직업적 특성을 조사하고자 하였다.
방법
해녀 21명 및 해녀와 유사한 연령과 체형, 체질량지수를 가진 25명을 선정하여 실험하였다. 한랭 부하 실험에서는 기후 챔버를 5°C로 설정하고 양발을 15°C의 물탱크에 30분간 담갔다. 고막 온도(Tty)와 피부 온도(Tsk)를 측정하고 평균 체온(mTb)을 계산하였다. 실험 전후로 혈액을 채취해 오렉신과 이리신 수치를 분석하였다.
결과
한랭 부하 실험 후 오렉신 수치는 해녀군은 12.17 ± 4.44 에서 12.95 ± 4.53 ng/mL (P < 0.01)으로, 대조군은 10.37 ± 3.84에서 11.25 ± 4.02 ng/mL(P < 0.001)으로 상승하였다. 이리신 수치도 해녀군은 4.83 ± 2.28에서 5.36 ± 2.23 ng/mL(P < 0.001)으로, 대조군은 3.73 ± 1.59에서 4.18 ± 2.04 ng/mL(P < 0.001)으로 상승하였다. 또한 실험 전 오렉신 및 이리신 수치가 대조군에 비해 해녀군에서 높았으며, 실험 후 대조군과 해녀군을 비교하였을 때에도 해녀군이 대조군에 비해 오렉신 및 이리신 수치가 유의미하게 높았음을 알 수 있다. (P < 0.05)
결론
저온 노출 조건에서 직업력 50년 이상인 해녀가 대조군에 비해 추위 내성이 높음을 알 수 있다. 본 연구에서 해녀의 한랭적응은 오렉신 및 이리신 등 발열에 관여하는 바이오마커의 기본적 차이가 존재하기 때문이라 설명된다. 따라서 해녀는 추위 생존에 있어 유리한 지위에 있다 할 것이다.

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Original Article

Association between coronavirus disease 2019-related workplace interventions and prevalence of depression and anxiety: Hyun Woo Park, Seung Hyun Park, Young Wook Kim, JunSeok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Chang Ho Chae, Eui Yup Chung, Hun Jeong; Ann Occup Environ Med 2022;34:e11. Published online June 3, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e11

Abstract Abstract in Korean PDF Supplementary Material

Background

Although coronavirus disease 2019 is causing a variety of psychological problems for workers, there are few longitudinal studies on changes in workers’ mental health by workplace intervention. This study aimed to evaluate the change in the prevalence of depression and anxiety according to the active involvement of the workplace.

Methods

This study was conducted on 1,978 workers at a workplace who underwent a health screening from January 2019 to August 2020, and classified depression and anxiety disorders using a self-report questionnaire. After the first pandemic, the company stopped health screening, took paid leave and telecommuting, and conducted interventions such as operating its own screening clinic. To see if this workplace intervention affects workers’ mental health, we conducted generalized estimating equations to compare odds ratio (OR).

Results

In the pre-intervention group, 384 people (16.86%) had depression, and 507 people (22.26%) had anxiety disorder. Based on the OR before intervention, the OR of depression decreased to 0.76 (0.66–0.87) and the OR of anxiety disorder decreased to 0.73 (0.65–0.82).

Conclusions

As a result of this study, it was confirmed that workplace intervention was related to a decrease in depression and anxiety. This study provides basic data to improve workers’ mental health according to workplace intervention, and further research is needed according to workplace intervention in the future.

코로나바이러스감염증-19 관련 사업장 개입과 우울증 및 불안장애 유병률 간의 관련성
목적
COVID-19가 근로자에게 다양한 심리적 문제를 야기하고 있지만, 사업장 개입이 근로자의 정신 건강의 변화에 대한 종단적 연구는 거의 없다. 이 연구는 사업장의 적극적인 개입 여부에 따른 우울, 불안의 유병률 변화를 평가하는 것을 목표로 하였다.
방법
본 연구는 2019년 1월부터 2020년 8월까지 건강검진을 받은 한 사업장의 근로자 1,978명을 대상으로 하였으며, 자기기입식 설문지를 이용하여 우울증, 불안장애를 분류하였다. 이 회사는 1차 대유행 이후 건강검진을 중단하고, 유급휴직 및 재택근무, 자체선별진료소 운영 등의 개입을 실시하였다. 이런 사업장 개입이 근로자의 정신건강에 영향을 미치는지 알아보기 위해 Generalized estimating equation(GEE)을 시행하여 Odds ratio(OR)을 비교하였다.
결과
Pre-intervention group에서 우울증은 총 384명(16.86%)이었으며, 불안장애는 총 507명(22.26%)이었다. Pre-intervention group의 OR를 기준으로 하였을 때, post-intervention group의 우울증 OR는 0.76(0.66-0.87), 불안장애의 OR는 0.73(0.65-0.82)로 감소하였다.
결론
본 연구 결과, 사업장의 개입이 우울, 불안의 감소와 관련이 있다는 것을 확인할 수 있었다. 본 연구는 사업장 개입 여부에 따른 근로자 정신건강을 개선시키기 위한 기초자료를 제공하며, 향후 사업장 개입에 따른 추가 연구가 필요할 것으로 본다.

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Seong-Uk Baek, Jong-Uk Won, Jin-Ha Yoon
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Original Article

Analysis of self-reported mental health problems among the self-employed compared with paid workers in the Republic of Korea: Yongho Lee, Junhyeong Lee, Ui-Jin Kim, Eunseun Han, Seunghon Ham, Won-Jun Choi, Seong-Kyu Kang, Wanhyung Lee; Ann Occup Environ Med 2022;34:e8. Published online April 8, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e8

Abstract Abstract in Korean PDF

Background

As self-employed workers are vulnerable to health problems, this study aimed to analyze mental health problems and sleep disturbances among self-employed workers compared with paid workers in Korea.

Methods

A total of 34,750 workers (23,938 paid workers and 10,812 self-employed workers) were analyzed from the fifth Korean Working Condition Survey, which included 50,205 households collected by stratified sampling in 2017. To compare mental health problems and sleep disturbance among self-employed workers and paid workers, multivariate logistic regression analyses were performed.

Results

The odds ratio in self-employed workers compared with paid workers was 1.25 (95% confidence interval [CI]: 1.09–1.42) for anxiety, 1.11 (95% CI: 1.04–1.17) for overall fatigue, 1.11 (95% CI: 1.04–1.20) for difficulty falling asleep, 1.10 (95% CI: 1.02–1.18) for difficulty maintaining sleep and 1.24 (95% CI: 1.16–1.32) for extreme fatigue after waking up.

Conclusions

Self-employed workers in Korea have a higher risk of self-reported mental health problems and sleep disturbances than paid workers. Further studies with a longitudinal design and structured evaluation are required to investigate the causal relationship between health problems and self-employment.

한국 자영업자의 주관적 정신건강 문제 : 제 5차 근로환경조사를 이용하여
목적
자영업자는 고용, 사업체 운영 등에 대한 스트레스를 받고 있으며 자신들의 건강관리에 취약한 것으로 여겨지고 있다. 이 연구는 자영업자들에게 초점을 맞춰 유급근로자들과 비교하여 정신건강 문제와 수면 장애를 분석하는 것을 목표로 하였다.
방법
이 연구는 한국의 5차 근로환경조사 데이터를 바탕으로 23,938명의 유급근로자와 10,812명의 자영업자들을 선택하여 분석을 수행하였다. 정신건강 문제는 ‘우울감’, ‘불안감’, ‘전신 피로’에 대한 설문과 수면 장애는 ‘잠들기가 어려움’, ‘자는 동안 반복적으로 깨어남’, ‘기진맥진함 또는 극도의 피곤함을 느끼며 깨어남’ 설문의 답변을 이용하였다. 자영업자의 정신건강 문제와 수면 장애를 분석하기 위해 다변량 로지스틱 회귀 분석을 시행하였다.
결과
자영업자에서의 ‘불안감’에 대한 보정된 오즈비는 1.25 (95% CI=1.09-1.42), ‘전신피로’는 1.11 (95% CI=1.04-1.17), ‘잠들기가 어려움’은 1.11 (95% CI=1.04-1.20), ‘자는 동안 반복적으로 깨어남’은 1.10 (95% CI=1.02-1.18) 그리고 ‘기진맥진함 또는 극도의 피곤함을 느끼며 깨어남’은 1.24 (95% CI=1.16-1.32)이었다.
결론
본 연구는 유급근로자에 비해 자영업자들의 정신건강 문제와 수면 장애의 위험성이 높은 것을 확인할 수 있었다. 자영업자들의 건강 보호와 증진을 위해 구조화된 설문, 전향적 연구 등의 추가적인 연구와 사회의 관심이 필요하다.

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Original Article

A pilot study to assess a risk of a high-risk group of low back pain membership in workers who perform the manual material handling tasks: Sungho Lee, Seongchan Heo, Jong-Young Lee; Ann Occup Environ Med 2021;33:e34. Published online November 17, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e34

Abstract PDF

Background

We conducted this experimental study to estimate a risk of a high-risk group of low back pain (LBP) membership in workers who perform the manual material handling (MMH) tasks in an actual workplace setting.

Methods

The subjects include healthy workers who were engaged in 12 MMH tasks at 6 manufacturing companies. We assessed the dynamic motion of trunk or lumbar spine using an industrial lumbar motion monitor (BioDynamics Laboratory of Ohio State University). The subjects were evaluated for the age, gender, years of working and anthropometric measurements (e.g., height, weight, shoulder height, elbow height, iliac height, leg length, trunk length, trunk circumference, iliac width, iliac depth, xiphoid width and xiphoid depth). Moreover, they were also evaluated for a risk of a high-risk group of LBP membership based on lift frequency, average twisting velocity, maximum moment, maximum sagittal flexion and maximum lateral velocity.

Results

The subjects who were engaged in a packaging at a detergent manufacturing company are at the greatest risk of LBP (63.76%). This was followed by packaging at a leather product manufacturing company (57.06%), packaging at a non-metallic casting material manufacturing company (57.03%), manual injection at a non-metallic casting material manufacturing company (52.00%), toggling at a leather product manufacturing company (46.09%), non-metallic casting material manufacturing company (42.88%), rolling at a non-metallic mineral product manufacturing company (42.12%), shooting at a non-metallic casting material manufacturing company (40.99%), vacuum processes at a leather product manufacturing company (35.00%), looping at a general industrial machinery manufacturing company (33.93%), setting at a leather product manufacturing company (30.22%) and packaging at a general metal product manufacturing company (22.02%).

Conclusions

Our approach indicates that there is a risk of a high-risk group of LBP membership in workers who perform the MMH tasks.

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Original Article

Sunlight exposure and eye disorders in an economically active population: data from the KNHANES 2008-2012: Junhyeong Lee, Ui-Jin Kim, Yongho Lee, Eunseun Han, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang; Ann Occup Environ Med 2021;33:e24. Published online July 16, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e24

Abstract Abstract in Korean PDF

Background

Sunlight exposure is a major risk factor for eye disorders. Most outdoor workers cannot avoid sunlight exposure. This study aimed to analyze the relationship between outdoor sunlight exposure and eye disorders in an economically active population.

Methods

This study analyzed the 2008–2012 Korea National Health and Nutritional Examination Survey data. Sunlight exposure was categorized as < 5 hours and > 5 hours. We also analyzed the dose-dependent relationship between exposure to sunlight and eye disorders (cataracts, pterygium, and age-related macular degeneration [AMD]) using data from 2010 to 2012 by subdividing the exposure groups into < 2 hours, 2–5 hours, and ≥ 5 hours. Eye disorders were diagnosed by an ophthalmologist. The study participants were stratified by sex, and the results were analyzed using the χ² test and multiple logistic regression analysis.

Results

In the female group, the odds ratio of pterygium in the high-level sunlight exposure group was 1.47 (95% confidence interval [CI]: 1.15–1.89). Regarding AMD, the odds ratios were 1.42 (95% CI: 1.16–1.73), 1.33 (95% CI: 1.03–1.73), and 1.58 (95% CI: 1.15–2.16) in the total, male, and female groups, respectively. Analysis of the dose-response relationship revealed that the odds ratios of pterygium in the high-level sunlight exposure subgroups of the total and female groups were 1.62 (95% CI: 1.25–2.08) and 2.00 (95% CI: 1.39–2.88), respectively.

Conclusions

This study demonstrated a relationship between sunlight exposure and eye disorders in an economically active population. Women were found to be especially vulnerable to pterygium. However, additional prospective studies to clarify the pathophysiology of pterygium are needed.

경제활동인구의 햇빛노출과 안질환:2008-2012 국민건강영향조사 자료 분석
목적
햇빛 노출은 안질환의 주된 위험인자이며, 일반 인구집단에서 안질환 유병률과의 관련이 잘 알려져 있다. 옥외작업자는 자신의 의지로 햇빛 노출을 피할 수 없을 가능성이 높다. 본 연구는 경제활동인구의 옥외 햇빛 노출과 안구 질환의 관계를 분석하는 것을 목적으로 하였다.
방법
이 연구는 2008-2012년 국민건강영양조사 자료를 집계하여 사용하였다. 햇빛 노출은 5시간 미만과 5시간 이상 노출 그룹으로 세분화되었으며, 2010-2012년 자료를 활용해 2시간 미만, 2-5시간, 5시간 이상 노출 그룹으로 세분화하여 양-반응 관계 분석을 시행하였다. 안질환은 안과의사에 의해 진단되었다. 연구 참여 집단을 성별로 층화하여 카이제곱 분석과 다중 로지스틱 회귀분석을 시행하였다.
결과
여성 집단에서 햇빛 고노출군의 익상편 유병 오즈비는 1.47 (95% CI=1.15-1.89)이었다. 나이관련황반변성의 경우 전체 집단에서 유병 오즈비는 1.42(95% CI=1.16-1.73), 남성 집단에서 1.33 (95% CI=1.03-1.73), 여성 집단에서 1.58 (95% CI=1.15-2.16)이었다. 양-반응 관계 분석 결과 햇빛 고노출군에서 전체 집단의 익상편 유병 오즈비는 1.62 (95% CI=1.25-2.08)이었고, 여성 집단에서는 2.00(95% CI=1.39-2.88)이었다.
결론
본 연구는 몇 가지 제한점이 있지만 경제활동인구에서의 햇빛 노출과 안질환 유병률에 대한 관계에 대한 정보를 제공한다. 특히 익상편의 경우 여성이 더 취약한 것으로 나타났는데, 발병기전을 고려한 전향적 연구 등의 추가적인 연구가 필요하다.

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Original Article

Distribution of Lung-RADS categories according to job type in a single shipyard workers: Eui Yup Chung, Young Hoo Shin, Young Wook Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Seung Hyun Park, Sung Joon Woo, Chang Ho Chae; Ann Occup Environ Med 2021;33:e22. Published online June 23, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e22

Abstract Abstract in Korean PDF

Background

Recently, lung cancer screenings based on age and smoking history using low-dose computed tomography (LDCT) have begun in Korea. This study aimed to evaluate the distribution of lung imaging reporting and data system (Lung-RADS) categories in shipyard workers exposed to lung carcinogens such as nickel, chromium, and welding fumes according to job type, to provide basic data regarding indications for LDCT in shipyard workers.

Methods

This study included 6,326 workers from a single shipyard, who underwent health examinations with LDCT between January 2010 and December 2018. Data on age, smoking status and history, medical history, and job type were investigated. The participants were categorized into high-exposure, low-exposure, and non-exposure job groups based on the estimated exposure level of nickel, chromium, and welding fumes according to job type. Cox proportional hazard regression analysis was used to determine the difference between exposure groups in Lung-RADS category ≥ 3 (3, 4A, and 4B).

Results

Out of all participants, 97 (1.5%) participants were classified into Lung-RADS category ≥ 3 and 7 (0.1%) participants were confirmed as lung cancer. The positive predictive value (ratio of diagnosed lung cancer cases to Lung-RADS category ≥ 3) was 7.2%. The hazard ratio (HR) of Lung-RADS category ≥ 3 was 1.451 (95% confidence interval [CI]: 0.911–2.309) in low-exposure and 1.692 (95% CI: 1.007–2.843) in high-exposure job group. Adjusting for age and pack-years, the HR was statistically significant only in the high-exposure job group (HR: 1.689; 95% CI: 1.004–2.841).

Conclusions

Based on LDCT and Lung-RADS, among male shipyard workers, Lung-RADS category ≥ 3 were significantly higher in the high-exposure job group. Their HR tended to be > 1.0 and was statistically significant in the high-exposure job group. Additional studies should be conducted to establish more elaborate LDCT indications for occupational health examination.

일개 조선소 근로자의 직종간 Lung-RADS 비교
목적
최근 폐암의 조기 발견을 위해 저선량 흉부CT (LDCT)를 이용하기 시작했으며, 국내에서도 연령과 흡연력을 기준으로 한 국가폐암검진이 시작되었다. 니켈, 크롬, 용접흄은 조선소 근로자에서 흔히 노출될 수 있는 폐암 발암물질로 알려져 있으나, 이러한 위험 요인은 아직 폐암 검진의 기준이 되지 못하였다. 이 연구는 LDCT를 이용하여 니켈, 크롬, 용접흄에 노출되는 일개 조선소 근로자들에서 직종과 폐 CT 선별 판독 시스템 (Lung-RADS) 양상을 비교하여, 조선소 근로자의 LDCT 적응증에 대한 기초 자료를 생성하고자 하였다.
방법
2010년 1월부터 2018년 12월까지 건강검진에 참여한 경남지역 조선소 근로자 6,326명이 연구에 참여했다. 문진과 자기기입식 설문지를 이용하여 연령, 흡연력, 과거력, 직종 등을 확인하여, 직군에 따른 크롬, 니켈, 용접흄의 노출 추정 정도에 따라 고노출 직군, 저노출 직군, 비노출군으로 분류하였다. 그룹 간 Lung-RADS 3 이상인 군에 차이가 있는지 cox 비례위험 회귀분석을 시행하였다. 또한 연령과 갑년을 보정하여 그룹간 hazard ratio (HR)를 비교하였다.
결과
전체 대상자 6,326명 중 Lung-RADS 3 이상인 군은 97명, 폐암으로 확진된 대상자는 7명으로, 양성예측도 (PPV)는 7.2%이였다. Lung-RADS 3 이상에 대하여 직군에 따른 HR은 저노출 직군 1.451 (95% confidence interval [CI]: 0.911-2.309), 고노출 직군 1.692 (95% CI: 1.007-2.843)으로 나타났다. 연령과 갑년을 보정했을 시 HR은 고노출 직군에서만 유의하게 1.689 (95% CI: 1.004-2.841)로 나타났다.
결론
현행의 폐암검진 방법인 LDCT와 진단기준인 Lung-RADS를 이용하였을 때, 일개 조선소 남성 근로자 중 니켈, 크롬, 용접흄 노출 직군에서 Lung-RADS 3 이상군이 유의하게 많으며, HR이 1.0보다 높은 경향을 보이고, 고노출 직군에서는 유의한 결과를 보였다. 향후 추가적인 연구를 통해 보다 정밀한 근로자 건강검진 상 LDCT 적응증을 만들어야 한다.

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Research Article

Speech-in-Noise Test results of compensation claimants for noise induced hearing loss in Korean male workers: Words-in-Noise Test (WIN) and quick-Hearing-in-Noise Test (HINT): Ji Soo Kim, Joong Keun Kwon, Nam Jeong Kim, Ji Ho Lee; Ann Occup Environ Med 2021;33:e11. Published online April 20, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e11

Abstract PDF

Background

Pure-tone audiometry is used as a gold standard for hearing measurement. However, since communication in the work environment occurs in noise, it might be difficult to evaluate the actual communication ability accurately based on pure-tone audiometry only. Therefore, the purpose of this study is to evaluate speech intelligibility in noisy environments by using Speech-in-Noise Tests and to check its relationship with pure-tone audiometry.

Methods

From January 2017 to September 2018, for 362 workers who visited a university hospital for the purpose of compensating for noise-induced hearing loss, several tests were conducted: pure-tone audiometry, speech reception threshold, speech discrimination score, and Speech-in-Noise Tests (Words-in-Noise Test [WIN] and quick-Hearing-in-Noise Test [quick-HINT]). The subjects were classified into serviceable hearing group and non-serviceable hearing group based on 40 dB hearing level (HL) pure-tone average. In both groups, we conducted age-adjusted partial correlation analysis in order to find out the relationship between pure-tone threshold, speech reception threshold, speech discrimination score and WIN and quick-HINT respectively.

Results

In non-serviceable hearing group, all results of partial correlation analysis were statistically significant. However, in serviceable hearing group, there were many results which showed little or no significant relationship between pure-tone threshold and Speech-in-Noise Tests (WIN and quick-HINT).

Conclusions

The relationship between Speech-in-Noise Tests and the pure-tone thresholds were different by the hearing impairment levels; in mild to moderate hearing loss workers, there was little or no relationship; in severe cases, the relationship was significant. It is not enough to predict the speech intelligibility of hearing-impaired persons, especially in mild to moderate level, with pure-tone audiometry only. Therefore, it would be recommended to conduct Speech-in-Noise Test.

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Case Report

Digital health care and arrhythmia: a case of WPW syndrome in South Korea, 2020: Eunchan Mun, Jihee Hong, Sunggu Kwon, Sung Ho Lee, Wonsool Kim, Changhwan Lee; Ann Occup Environ Med 2021;33:e8. Published online March 24, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e8

Abstract PDF

Background

The digital health care field is expanding from the daily monitoring of chronic diseases to the detection of acute diseases, such as arrhythmia. Wolff-Parkinson-White (WPW) syndrome, a congenital cardiac disorder due to accessory pathways, causes tachycardia, syncope, and even sudden death.

Case presentation

We presented a 26-year-old female office worker with WPW syndrome managing the disease with a wearable device and discussed its significance in occupational medicine. After reviewing the worker's electrocardiogram results, symptoms, and pulse rate records extracted from the wearable device, we referred the worker to a cardiologist for further evaluations such as electrophysiology study. The worker monitors her symptom recurrence with the wearable device following successful radiofrequency catheter ablation of the bypass tract.

Conclusions

A case of an office worker with WPW syndrome managing the disease using a smart watch is presented. Further research is required to ensure its scientific validity, and we suggest policymakers promptly introduce digital health care to occupational environments.

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Research Article

Relationship between long work hours and self-reported sleep disorders of non-shift daytime wage workers in South Korea: data from the 5th Korean Working Conditions Survey: Hongsuk Choi, Sungho Lee, Man-Joong Jeon, Young-Sun Min; Ann Occup Environ Med 2020;32:e35. Published online November 3, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e35

Abstract PDF

Background

Studies have investigated the relationship between long work hours and sleep disorders; however, they have focused on shift workers or specific workers who are at high risk of industrial accidents rather than wage workers in general. The purpose of this study is to investigate the effects of long work hours on sleep disorders among non-shift daytime wage workers.

Methods

We conducted a secondary analysis of data from the 5th Korean Working Conditions Survey. From the 50,205 total participants, we included 26,522 non-shift daytime wage workers after excluding self-employed people, business owners, unpaid family employees, and wage workers who work nights and shifts. Sleep disorders were categorized into “difficulty in falling asleep,” “frequent waking,” and “waking up with fatigue.” Logistic regression analysis was used to evaluate the influence of long work hours on sleep disorders, and the odds ratios (ORs) were calculated.

Results

The OR of working > 52 hours per week was 1.183 (95% confidence interval [CI]: 1.002–1.394) for the risk of developing insomnia compared with working ≤ 40 hours per week. The OR of waking up with fatigue was 1.531 (95% CI: 1.302–1.801). Long work hours showed no significant relationship with difficulty in falling asleep or with frequent waking.

Conclusions

Working for extended hours was associated with increased fatigue upon waking in non-shift daytime wage workers.

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Research Article

Combined effect of emotional labor and job insecurity on sleep disturbance among customer service workers: Sunguk Choi, Kwon Ko, Jae Bum Park, Kyung-Jong Lee, Seungho Lee, Inchul Jeong; Ann Occup Environ Med 2020;32:e33. Published online September 10, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e33

Abstract PDF

Background

Job insecurity and emotional labor are poor job-related factors that are known to cause sleep disturbances in customer service workers. This study investigates the combined effect of emotional labor and job insecurity on sleep disturbance.

Methods

This study used data from the Fifth Korean Working Condition Survey and included 15,147 paid workers who serve customers below 65 years. We re-classified into 6 groups based on whether the degree of emotional labor increased (Rarely/Sometimes/Always) or whether job insecurity (No/Yes) was present. We performed propensity score matching for several covariates and calculated odds ratio (OR) and 95% confidence intervals (CIs) for sleep disturbance by logistic regression models using only matched subjects.

Results

Workers exposed to emotional labor and job insecurity had significantly higher risk for 3 dimensions of sleep disturbance (difficulty falling asleep, waking up repeatedly during the sleep, and waking up with feeling of fatigue) (OR [95% CI]: 1.44 [1.22–1.69], 1.18 [0.99–1.40], 1.52 [1.30–1.79] for emotional labor; and 2.00 [1.75–2.29], 2.20 [1.91–2.53], 1.67 [1.45–1.92] for job insecurity). Compared to those who were exposed to both emotional labor rarely and without job insecurity, when workers had both poor job factors, the OR (95% CI) for sleep disturbance for difficulty falling asleep, waking up repeatedly during the sleep, and waking up with feeling of fatigue were 3.05 (2.42–3.86), 2.89 (2.26–3.69), and 2.60 (2.06–3.29), respectively. The relative excess risk due to Interaction of job insecurity and emotional labor was significant only for difficulty falling asleep, but not the other 2 sleep disturbance dimensions.

Conclusions

Customer service workers suffered from severe sleep disturbances according to the existing degree of emotional labor and job insecurity. The combined effect of both could have an additive influence on serious sleep disturbance among customer service workers.

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Research Article

Distribution of age, gender, and occupation among individuals with carpal tunnel syndrome based on the National Health Insurance data and National Employment Insurance data: Il-Ho Lee, Young-Ki Kim, Dong-Mug Kang, Se-Yeong Kim, In-Ah Kim, Eun-Mi Kim; Ann Occup Environ Med 2019;31:e31. Published online November 7, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e31

Abstract PDF

Background

The present study aimed to investigate the basic characteristics of carpal tunnel syndrome (CTS) and its differences between occupations using Korea's National Health Insurance (NHI) and National Employment Insurance (NEI).

Methods

The study participants were obtained from the NEI and NHI data from 2008 to 2015, with a diagnosis code of G560 (CTS) as the main or sub-diagnosis. Data about gender, age, diabetes mellitus, smoking, drinking, and length of employment, information about type of occupation, and number of employees according to age and occupation were obtained from NHI and NEI data. In total, 240 occupations were classified into blue-collar (BC) and white-collar (WC) work. In addition, each occupation was classified as high-risk and low-risk groups depending on the degree of wrist usage.

Results

The number of patients with CTS per 100,000 individuals increased with advancing age, and it was higher in women (4,572.2) than in men (1,798.5). Furthermore, the number was higher in BC workers (3,247.5) than in WC workers (1,824.1) as well as in the high-risk group than in the low-risk group in both BC workers (3,527.8 vs. 1,908.2) and WC workers (1,829.9 vs. 1,754.4). The number of patients with CTS was higher in the high-risk group than in the low-risk group among male and female BC workers and female WC workers. However, the number was higher in the low-risk group among male WC workers. In the BC category, the number of patients with CTS was highest among food processing-related workers (19,984.5). In the WC category, the number of patients with CTS was highest among social workers and counselors (7,444.1).

Conclusions

The results of this study are expected to help identify occupational differences in patterns of CTS. High number of patients with CTS was seen in new jobs, as well as in previous studies.

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Research Article

Association between job-related stress and experience of presenteeism among Korean workers stratified on the presence of depression: Jihyun Kim, Yeong-Kwang Kim, Sung-Ho Leem, Jong-Uk Won; Ann Occup Environ Med 2019;31:e26. Published online September 30, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e26

Abstract PDF Supplementary Material

Background

Presenteeism refers to the phenomenon of working while sick. Its development can be attributed to not only somatic symptoms but also underlying social agreements and workplace atmosphere. In this study, we analyzed presenteeism among workers from various industries, focusing on job-related stress with stratification on the presence of depression.

Methods

We conducted the study with data from questionnaires filled in by different enterprises enrolled in the Federation of Korean Trade Unions. Workers' depressive symptoms were investigated using the Patient Health Questionnaire-2, while questions on job-related stress and presenteeism were derived from the short form of the Korean Occupational Stress Scale and the official Korean version of the Work-Productivity and Activity Impairment Questionnaire-General Health, respectively. Multilevel logistic analysis was conducted to determine the statistical differences derived from the differences between companies.

Results

In total, 930 participants (753 men and 177 women) from 59 enterprises participated in the research. We conducted multilevel logistic regression to determine the association between the variables and presenteeism, with stratification by the presence of depression. Higher job demands and higher interpersonal conflict showed significantly elevated odds ratios (ORs) in univariate models and in the multivariate multilevel model. In the final model of total population, fully adjusted by general and work-related characteristics, higher job demands (OR: 3.29, 95% confidence interval [CI]: 2.08–5.21) and interpersonal conflict (OR: 1.87, 95% CI: 1.29–2.71) had significantly higher ORs—a tendency that remained in participants without depression.

Conclusions

This study reflected the factors associated with presenteeism among workers from various enterprises. The findings revealed that job-related stress was closely related to presenteeism in both the total population and in the population without depression. Thus, it emphasized interventions for managing job stress among workers to reduce presenteeism in general workers' population.

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Research Article

The association between dependent self-employment and self-reported depression/anxiety and sleep disorder in South Korea: Guyeon Won, Jae Bum Park, Kyung-Jong Lee, Ryun Ha, Seungho Lee, Inchul Jeong; Ann Occup Environ Med 2019;31:e13. Published online July 29, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e13

Abstract PDF

Background

Dependent self-employment is precarious employment, which can be vulnerable to mental health problems. This study aimed to investigate the association of dependent self-employment with depression, anxiety, and sleep disorder in South Korea.

Methods

This study used data from the Fourth Korean Working Conditions Survey and included 32,691 paid workers. Dependent self-employment and self-reported depression/anxiety, and sleep disorder were investigated using a questionnaire. Logistic regression analysis was performed to investigate the association between dependent self-employment and mental health problems.

Results

Of the 32,691 paid workers, 2,371 (7.3%) were dependent self-employed workers. The odds ratio (OR) of dependent self-employment for self-reported depression/anxiety was 1.78 (95% confidence interval [CI]: 1.29–2.45) and the OR of dependent self-employment for self-reported sleep disorder was 1.26 (95% CI: 1.01–1.59) compared to other paid workers.

Conclusions

Dependent self-employment is related to an increased risk of self-reported depression/anxiety and sleep disorder in South Korea.

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Peter A. Creed, Michelle Hood, Eva Selenko, Shi Hu, Louella Bagley
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Research Article

The effect of diabetes on 4-year changes of hearing thresholds in male workers exposed to noise in a single company: a longitudinal study: Dae Yun Kim, A Ram Kim, Joo Hyun Sung, Choong Ryeol Lee, Jiho Lee; Ann Occup Environ Med 2019;31:e11. Published online June 28, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e11

Abstract PDF

Background

Recently, several studies have assessed the association between diabetes and hearing impairment. However, the effect of diabetes on hearing impairment is not well known in diabetic patients exposed to noise, a typical cause of hearing impairment. The aim of this study is to longitudinally analyze the effect of diabetes on hearing impairment in workers exposed to similar noise levels from 2013 to 2017 who had experienced little change in their working conditions.

Methods

The study subjects included 2,087 male workers exposed to noise in a single company and who underwent health examinations at the same hospital in Ulsan city in 2013 and 2017. Hearing impairment was defined that a pure-tone average of pure-tone audiometry (PTA) thresholds at 1,000, 2,000, 3,000, and 4,000 Hz was 25 dB and over in both ears. Statistical analyses were conducted using χ² tests, ANOVA, and Cox proportional hazard models. We analyzed covariates that might affect hearing impairment, including age; working period; levels of total cholesterol, triglyceride, and serum creatinine; smoking and alcohol history; and noise level.

Results

The average PTA thresholds and their average changes between 2013 and 2017 were significant in the diabetes mellitus (DM) group than those in the normal and impaired fasting glucose group. Among the subjects with the same status of fasting glucose group in 2013 and 2017, the adjusted hazard ratios for incident hearing impairment among those in the DM group compared to normal group were 3.35 (95% confidence interval [CI], 1.54–7.29) in the left ear and 5.66 (95% CI, 2.01–15.98) in the right ear.

Conclusions

This study suggested that the risk of hearing impairment in the DM group was significantly higher than that in the normal group in both ears, even when exposed to similar noise levels.

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Lan Zhang, Hui Liao, Zongnan Li, Jianhui Yuan
Noise and Health.2024; 26(123): 449. CrossRef
Noise-induced Hearing Loss among Non-Medical Workers in a Healthcare Institution
Manju Deena Mammen, Ann Mary Augustine, Anjali Lepcha, Jessie Sophia Sharma, Arockiaraj Arul Prakash, Ajay Philip
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Research Article

The effect of shift work on high sensitivity C-reactive protein level among female workers: Ho Sung Kwak, Hyoung Ouk Park, Young Ouk Kim, Jun Seok Son, Chan Woo Kim, Jun Ho Lee, Young Hoo Shin, Seung Hyun Park, Eui Yup Chung, Chang Ho Chae; Ann Occup Environ Med 2019;31:e5. Published online May 28, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e5

Abstract PDF

Background

This study assessed the association between shift work and high-sensitivity C-reactive protein (hs-CRP) level, a risk factor for cardiovascular disease (CVD), in female workers in electronics manufacturing services (EMS).

Methods

Female EMS workers who received special medical examinations for workers in Gyeongnam, Korea between January 2017 and December 2017 were enrolled in this study. Their age, marital status, education level, alcohol consumption, smoking habit, regular exercise, quality of sleep, work stress, and depression were investigated, and blood tests were conducted. The t- and χ² tests were conducted to compare the general and biochemical characteristics between daytime and shift worker groups. Age-adjusted partial correlation analysis was performed to examine the linear relationship between hs-CRP level and other risk factors for CVDs. In addition, the difference in hs-CRP levels according to work schedule was analyzed by ANCOVA after adjusting for variables that could affect the hs-CRP level.

Results

Although the average hs-CRP levels did not differ significantly between daytime and shift workers (0.92 ± 1.87 and 1.07 ± 2.20 mg/dL, respectively), shift workers tended to show a higher hs-CRP level (p = 0.067). After adjusting for variables that can affect the hs-CRP level, the estimated average hs-CRP level was significantly higher in shift workers (1.325 ± 0.156 mg/dL) than that in daytime workers (0.652 ± 0.350 mg/dL) (p = 0.003).

Conclusions

The results of this study identified a relationship between shift work and hs-CRP level increase in women. Because multiple studies have reported associations between increased hs-CRP and CVD, follow-up of hs-CRP may help early detection of CVD in shift workers.

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Sarah Coven, Sanja Jelic, Marie-Pierre St-Onge
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Research Article

Comparison of risk-assessment tools for cardio-cerebrovascular diseases (CVD) in male shipyard workers: a cross-sectional study: Jea Chul Ha, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Hyun Woo Park; Ann Occup Environ Med 2019;31:e4. Published online May 23, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e4

Abstract PDF

Background

Periodic revision of assessment tools is essential to ensure risk assessment reliability and validity. Despite the recent revision of the Korea Occupational Safety and Health Agency (KOSHA) 2018, there is no evidence showing that the revision is superior to other cardio-cerebrovascular diseases (CVDs) risk-assessment tools for workplace health management. We conducted a comparative analysis using the Framingham risk score (FRS) as a gold standard to identify the most relevant CVDs risk-assessment tool for workplace health management.

Methods

We included 4,460 shipyard workers who had undergone a workers' health examination during January–December 2016. Risk levels for CVDs were calculated based on the FRS, KOSHA 2013, KOSHA 2017, KOSHA 2018 (2 methods), National Health Screening Program health risk appraisal (NHS HRA) 2017, and NHS HRA 2018. Study participants were categorized into low-risk, moderate-risk, or high-risk groups. Sensitivity, specificity, correlation, and agreement of each risk-assessment tool were calculated compared with the FRS as a gold standard. For statistical analyses, Spearman's rank correlation coefficient and the linearly weighted kappa coefficient were calculated.

Results

Sensitivity of the risk assessments was highest in the KOSHA 2018 (health risk appraisal [HRA]). The FRS showed correlation coefficients of 0.354 with the KOSHA 2013, 0.396 with the KOSHA 2017, 0.386 with the KOSHA 2018, 0.505 with the KOSHA 2018 (HRA), 0.288 with the NHS HRA 2017, and 0.622 with the NHS HRA 2018. Kappa values, calculated to examine the agreement in relation to the KOSHA 2013, KOSHA 2017, KOSHA 2018, KOSHA 2018 (HRA), NHS HRA 2017, and NHS HRA 2018 with the FRS, were 0.268, 0.322, 0.352, 0.136, 0.221, and 0.559, respectively.

Conclusions

The NHS HRA 2018 risk calculation method is a useful risk-assessment tool for CVDs, but only when appropriate classification criteria are applied. In order to enhance the risk-group identification capability of the KOSHA guideline, we propose to apply the classification criteria set in this study based on the risk group definition of the 2018 Korean Society of Hypertension guidelines for the management of hypertension instead of the current classification criteria of the KOSHA 2018.

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Research Article

Difference in health status of Korean farmers according to gender: Ho Lee, Seong-yong Cho, Jin-seok Kim, Seong-yong Yoon, Bu-il Kim, Jong-min An, Ki-beom Kim; Ann Occup Environ Med 2019;31:7. Published online March 8, 2019; DOI: https://doi.org/10.1186/s40557-019-0287-7

Abstract PDF

Background

The objective of this study was to compare differences in lifestyle diseases, musculoskeletal pain, psychosocial stress, and self-health awareness according to gender in Korean farmers.

Methods

The study population comprised 436 farmers residing in rural areas in Korea. A self-administered questionnaire was used to survey demographic characteristics, health-related behaviors, and musculoskeletal pain. The psychosocial well-being index short form (PWI-SF) was used to survey psychosocial stress, and the 12-item short form health survey (SF-12) was used to survey self-health awareness. In addition, a clinical examination was performed for each participant, and lifestyle diseases were identified through a health checkup.

Results

Among lifestyle diseases, females showed a significantly higher proportion than males for metabolic syndrome (OR: 4.57 [95% CI, 1.67–12.51]). For musculoskeletal pain, females again showed significantly higher proportion than males for hand pain (OR: 16.79 [95% CI, 3.09–91.30]), and pain in at least one body part (OR: 2.34 [95% CI, 1.16–4.70]). For psychosocial stress, females showed a significantly higher proportion than males for high-risk stress (OR: 3.10 [95% CI, 1.17–8.24]). Among the items in self-health awareness, females showed significantly higher proportion than males for mental component score (MCS) (OR: 3.10 [95% CI, 1.52–6.31]) and total score (OR: 2.34 [95% CI, 1.11–4.90]).

Conclusions

For all items that showed significant differences, females showed higher proportion than males, which indicates that female farmers tended to have poorer overall health than male farmers. Therefore, specialized programs will have to be developed to improve the health of female farmers.

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Research Article

Factors related with quality on sleep of daytime workers: Bu-il Kim, Seong-yong Yoon, Jin-seok Kim, Kuck-Hyeun Woo, Seong-yong Cho, Ho Lee, Jong-min An; Ann Occup Environ Med 2018;30:63. Published online October 23, 2018; DOI: https://doi.org/10.1186/s40557-018-0271-7

Abstract PDF

Background

This study was conducted to identify the sleep status of daytime workers who do not work in shifts. This study analyzed factors affecting sleep duration and sleep quality.

Methods

This study was conducted on 1171 daytime workers at a manufacturing workshop. We used a self-administered questionnaire to investigate demographic variables, work type, working period, musculoskeletal symptoms and the Pittsburgh Sleep Quality Index to assess sleep. Regular health checkup was conducted for the worker’s clinical examination.

Results

The mean sleep duration was 6.36 h and the mean score on the Pittsburgh Sleep Quality Index was 4.46. Work type and obesity were related to sleep duration. Age, obesity and musculoskeletal pain were significantly related to sleep quality. The prevalence ratio of researcher group for short sleep duration was 1.27 (95% confidence interval: 1.02–1.58). The prevalence ratio of those aged 50 years and over was 0.47 (0.25–0.91) and of those in their 40s was 0.56 (0.35–0.91) for poor sleep quality compared to those in their 20s. The prevalence ratio of the obesity group for poor sleep quality was 1.53 (1.10–2.12). The prevalence ratio of musculoskeletal pain group for poor sleep quality was 1.92 (1.29–2.84).

Conclusions

Age, obesity and musculoskeletal pain were factors affecting the poor quality on sleep of daytime workers. In addition, work type related to short sleep duration.

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Research Article

Changes of depression and job stress in workers after merger without downsizing: Jun Ick Jung, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Jea Chul Ha; Ann Occup Environ Med 2018;30:54. Published online August 29, 2018; DOI: https://doi.org/10.1186/s40557-018-0266-4

Abstract PDF

Background

Since the 1980s, restructuring, which includes downsizing, closures, mergers, and privatization, has expanded worldwide, and various studies have investigated its effect on health. However, previous studies have mainly focused on restructuring accompanied by massive lay-offs, and the effect of a merger on workers’ health is still controversial. This study aims to investigate changes in worker depression and job stress after a merger without downsizing, which is unusual in Korea.

Methods

Repeated surveys were done in April 2014, April 2015, and April 2016 involving the participation of 209 subjects. Participants were divided into two groups, which were comprised of blue-collar workers (104) and white-collar workers (105). Sociodemographic characteristics, including age, education level, job tenure, gender, marital status, smoking status, and alcohol consumption, were measured via a survey. To determine the level of depression, the Korean version of the Center for Epidemiologic Studies Depression Scale (CES-D) was employed, and to investigate job stress, the Korean Occupational Stress Scale-Short Form (KOSS-SF) was used. For statistical analyses, Pearson’s chi-square test, the Student’s t-test, and repeated measure analysis of variance (ANOVA) were performed.

Results

The results showed that depression (CES-D, F[2, 400] = 0.466, p = 0.628) was changed but without significance and job stress (KOSS-SF, F[1.899, 379.831] = 3.192, p = 0.045) were significantly different. The between-group difference in the CES-D score between the blue- and white-collar workers by survey administration time was not statistically significant (F = 0.316, p = 0.574). The interaction between the survey time and occupational group was also not statistically significant (F = 0.967, p = 0.381). The between-group difference in the KOSS-SF total score was not statistically significant (F = 1.132, p = 0.289), and the interaction between the survey administration time and occupational group was also not significant (F = 0.817, p = 0.437). In the job stress subgroup analyses Job insecurity and Lack of reward showed a significant difference by survey administration time.

Conclusion

This study showed that a merger without massive downsizing can cause negative health effects such as an changes in depression and increase in job stress. To improve the health of workers, both the immediate negative effects on health, and the long-term effects or their resolution over time should be considered prior to the merger.

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A Review of Psychological Stress among Students and Its Assessment Using Salivary Biomarkers
Bruno Špiljak, Maja Vilibić, Ana Glavina, Marija Crnković, Ana Šešerko, Liborija Lugović-Mihić
Behavioral Sciences.2022; 12(10): 400. CrossRef

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Correction

Correction to: Perceptions regarding utilization of meteorological information in healthcare in Korea: a qualitative study: Minsu Ock, Eun Young Choi, Inbo Oh, Seok Hyeon Yun, Yoo-Keun Kim, Hyunsu Kim, Min-Woo Jo, Jiho Lee; Ann Occup Environ Med 2018;30:30. Published online May 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0234-z

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Research Article

Perceptions regarding utilization of meteorological information in healthcare in Korea: a qualitative study: Minsu Ock, Eun Young Choi, Inbo Oh, Seok Hyeon Yun, Yoo-Keun Kim, Hyunsu Kim, Min-Woo Jo, Jiho Lee; Ann Occup Environ Med 2018;30:8. Published online February 1, 2018; DOI: https://doi.org/10.1186/s40557-018-0214-3

Abstract PDF

Background

Health forecasting has been used in an attempt to provide timely and tailored meteorological information to patients and healthcare providers so that they might take appropriate actions to mitigate health risks and manage healthcare-related needs. This study examined the in-depth perceptions of healthcare providers and the general public regarding the utilization of meteorological information in the healthcare system in Korea.

Methods

The COREQ (Consolidated Criteria for Reporting Qualitative Research) checklist was applied to this study. We conducted three focus group discussions in accordance with semi-structured guidelines developed to deal with various aspects of the utilization of meteorological information in healthcare settings. The verbatim transcriptions and field notes were analyzed according to content analysis.

Results

Six physicians, four nurses, three emergency medical technicians, and seven members of the general public participated in the focus group discussions. There were some individual discrepancies among most participants regarding the health effects of climate change. Although several physician participants felt that meteorological information utilization is not a prime concern during patient care, most of the general public participants believed that it should be used in the patient care process. The provision of meteorological information to patients undergoing care is expected to not only improve the effective management of climate-sensitive diseases, but also boost rapport between healthcare providers and patients.

Conclusions

More attempts should be made to provide meteorological information to groups vulnerable to climate change, and the effects of this information should be evaluated in terms of effectiveness and inequality. The findings of this study will be helpful in countries and institutions trying to introduce health forecasting services.

Electronic supplementary material

The online version of this article (10.1186/s40557-018-0214-3) contains supplementary material, which is available to authorized users.

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Sri Saahitya Uppalapati, Eryn Campbell, John Kotcher, Kathryn Thier, Patrick Ansah, Neha Gour, Edward Maibach
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Correction to: Perceptions regarding utilization of meteorological information in healthcare in Korea: a qualitative study
Minsu Ock, Eun Young Choi, Inbo Oh, Seok Hyeon Yun, Yoo-Keun Kim, Hyunsu Kim, Min-Woo Jo, Jiho Lee
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef

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Research Article

The association between cadmium and lead exposure and blood pressure among workers of a smelting industry: a cross-sectional study: Hyun Chan An, Joo Hyun Sung, Jiho Lee, Chang Sun Sim, Sang Hoon Kim, Yangho Kim; Ann Occup Environ Med 2017;29:47. Published online October 4, 2017; DOI: https://doi.org/10.1186/s40557-017-0202-z

Abstract PDF

Background

Lead and cadmium are harmful heavy metals that are used for a variety of occupational purposes. Considering their potentially hazardous effects on health, studies on the association between exposure to these two heavy metals and health disorders have been actively conducted. This study aimed to determine the association between blood lead and cadmium levels and blood pressure in workers exposed to lead and cadmium in a smelter.

Methods

Nine hundred and sixty-three male workers who worked in a smelter, and underwent medical examinations at the Ulsan University Hospital between January 1 and December 31, 2014, were selected as participants. Among them, 310 subjects whose data on height, weight, blood pressure, fasting blood glucose, lipid profile, and blood lead and cadmium levels were available and who answered the questionnaire were selected as the final participants. We investigated the drinking habit, smoking status, exercise adequacy, and family history of hypertension of these workers using formal questionnaires. A statistical analysis was conducted using Student’s t-test, analysis of variance, and linear or logistic regression.

Results

The association between blood lead and cadmium levels and blood pressure was analyzed through statistical adjustment of the risk factors of hypertension. Results showed an association between blood cadmium level and blood pressure elevation. However, blood lead level was found to be not correlated with blood pressure elevation.

Conclusions

This study shows the association between blood cadmium level and systolic blood pressure (SBP) and diastolic blood pressure (DBP) elevation.

Trial registration

IRB No. 2017–03-037. Retrospectively Registered 30 March 2017.

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Research Article

The relationship between serum vitamin D levels and sleep quality in fixed day indoor field workers in the electronics manufacturing industry in Korea: Young Saeng Jung, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Ho Sung Kwak; Ann Occup Environ Med 2017;29:25. Published online June 24, 2017; DOI: https://doi.org/10.1186/s40557-017-0187-7

Abstract PDF

Background

Although recent studies have investigated the influence of vitamin D on sleep patterns, there is a lack of research on the relationship between vitamin D and sleep patterns in Korean workers. This study focused on the relationship between serum vitamin D levels and sleep in fixed day indoor field workers in the electronics manufacturing industry in Korea.

Methods

The 1472 subjects who were included in this study were selected from fixed day workers in the electronics manufacturing industry who had received a worker’s special health examination at a hospital in Changwon, South Gyeongsang Province between January 2015 and December 2015. Nighttime workers and those who showed symptoms of depression were excluded from this study. The sociodemographic and lifestyle variables of the participants were investigated, including age, sex, marital status, level of education, body mass index, smoking habits, alcohol consumption habits, and regular exercise. Work-related factors were evaluated, such as employee tenure and occupational stress. Serum 25-hydroxyvitamin D was measured as an indicator of vitamin D levels, and quality of sleep was evaluated using the Pittsburgh Sleep Quality Index (PSQI) translated into Korean.

Results

The subjects had a mean serum vitamin D level of 13.70 ± 5.93 ng/mL. Vitamin D deficiency, defined as a serum vitamin D level of <10 ng/mL, was found in 24.8% of males and significantly more frequently in females (47.6%). Poor sleep quality was reported by 19.8% of participants with serum vitamin D levels ≥10 ng/mL and by 21.7% of those with serum vitamin D levels <10 ng/mL, which was a significant difference (P = .007). Multiple logistic regression analysis adjusting for significant variables found that poor sleep quality was more likely in those with vitamin D deficiency than those with higher serum vitamin D levels (odds ratio = 1.36; 95% CI, 1.01–1.82). A comparison of serum vitamin D levels and PSQI components showed that the mean scores for subjective sleep quality, sleep latency, and sleep duration were significantly higher in the vitamin D-deficient participants, indicating that the vitamin D-deficient participants had poorer sleep quality.

Conclusions

This study investigated serum vitamin D levels in fixed day indoor field workers in the manufacturing industry in Korea and analyzed the relationship of vitamin D deficiency with sleep quality. A significant correlation was found between serum vitamin D deficiency and poor sleep quality. Based on the results of this study, sleep disorder management for workers can be improved by providing regular examinations checking their serum vitamin D levels and supplying vitamin D to workers with serum vitamin D deficiency to enhance their quality of sleep.

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Research Article

The responses of subjective feeling, task performance ability, cortisol and HRV for the various types of floor impact sound: a pilot study: Seok Hyeon Yun, Sang Jin Park, Chang Sun Sim, Joo Hyun Sung, Ahra Kim, Jang Myeong Lee, Sang Hyun Lee, Jiho Lee; Ann Occup Environ Med 2017;29:13. Published online May 15, 2017; DOI: https://doi.org/10.1186/s40557-017-0168-x

Abstract PDF

Background

Recently, noise coming from the neighborhood via floor wall has become a great social problem. The noise between the floors can be a cause of physical and psychological problems, and the different types of floor impact sound (FIS) may have the different effects on the human’s body and mind. The purpose of this study is to assess the responses of subjective feeling, task performance ability, cortisol and HRV for the various types of floor impact.

Methods

Ten men and 5 women were enrolled in our study, and the English listening test was performed under the twelve different types of FIS, which were made by the combinations of bang machine (B), tapping machine (T), impact ball (I) and sound-proof mattress (M). The 15 subjects were exposed to each FIS for about 3 min, and the subjective annoyance, performance ability (English listening test), cortisol level of urine/saliva and heart rate variability (HRV) were examined. The sound pressure level (SPL) and frequency of FIS were analyzed. Repeated-measures ANOVA, paired t-test, Wilcoxon signed rank test were performed for data analysis.

Results

The SPL of tapping machine (T) was reduced with the soundproof mattress (M) by 3.9–7.3 dBA. Impact ball (I) was higher than other FIS in low frequency (31.5–125 Hz) by 10 dBA, and tapping machine (T) was higher than other FIS in high frequency (2–4 k Hz) by 10 dBA. The subjective annoyance is highest in the combination of bang machine and tapping machine (BT), and next in the tapping machine (T). The English listening score was also lowest in the BT, and next in T. The difference of salivary cortisol levels between various types of FIS was significant (p = 0.003). The change of HRV parameters by the change of FIS types was significant in some parameters, which were total power (TP) (p = 0.004), low frequency (LF) (p = 0.002) and high frequency (HF) (p = 0.011).

Conclusions

These results suggest that the human’s subjective and objective responses were different according to FIS types and those combinations.

Citations

Citations to this article as recorded by

Quantifying the Effect of Noise on Cognitive Processes
Jan Grenzebach, Erik Romanus
Noise and Health.2022; 24(115): 199. CrossRef

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Research Article

Effect of shift work on hypertension: cross sectional study: Jeong Han Yeom, Chang Sun Sim, Jiho Lee, Seok Hyeon Yun, Sang Jin Park, Cheol-In Yoo, Joo Hyun Sung; Ann Occup Environ Med 2017;29:11. Published online April 11, 2017; DOI: https://doi.org/10.1186/s40557-017-0166-z

Abstract PDF

Background

The need of efficient resource management and full-time accessibility to resources has increased with the development of industry, resulting in the increase of shift workers. Previous researches of past decades show that there are various health effects on shift workers. However, the definition and the form of shift work have varied from each research and occupational harmful factors except for shift work have not been excluded completely in previous researches. Therefore, in this research, we tried to find out the effect of shift work focusing on the hypertension. To complement previously mentioned weakness of other researches, we performed our research on participants to whom we could minimize other risk factors excluding shift work.

Methods

This research examined 1,953 petrochemical plant male workers (shift work 1,075, day worker 878) who did medical checkup from 1st Jan. 2014 to 31th Dec. 2014 in a general hospital located in Ulsan, based on their medical records and questionnaires. With the questionnaire, we found out their basic information including age, social status, occupational history, and we took their physical measurements.

Results

Compared to day workers, shift workers’ odds ratio of developing hypertension was 1.31 (95% CI 0.98–1.75). After adjusting confounding variables, adjusted odds ratio for entire subjects was 1.51 (95% CI 1.11–2.06). Also, for subjects who were in continuous service for over 20 years, odds ratio was 1.51 (95% CI 1.08–2.11).

Conclusions

Shift workers had a higher chance of hypertension than day workers do. Particularly, the longer the workers work continuously, the risk of hypertension getting higher.

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Research Article

Comparisons of hearing threshold changes in male workers with unilateral conductive hearing loss exposed to workplace noise: a retrospective cohort study for 8 years: Sang Jin Park, Joo Hyun Sung, Chang Sun Sim, Seok Hyeon Yun, Jeong Han Yeom, Joong-Keun Kwon, Jiho Lee; Ann Occup Environ Med 2016;28:51. Published online September 22, 2016; DOI: https://doi.org/10.1186/s40557-016-0132-1

Abstract PDF

Background

The purpose of this study was to investigate hearing threshold changes of workers with unilateral conductive hearing loss who were exposed to workplace noise for 8-years.

Methods

Among 1819 workers at a shipyard in Ulsan, 78 subjects with an air-bone gap ≥10 dBHL in unilateral ears were selected. Factors that could affect hearing were acquired from questionnaires, physical examinations, and biochemistry examinations. Paired t-test was conducted to compare the hearing threshold changes over time between conductive hearing loss (CHL) ear and sensorineural hearing loss (SNHL) ear.

Results

The study included male subjects aged 48.7 ± 2.9, having worked for 29.8 ± 2.7 years. Hearing thresholds increased significantly in CHL ears and SNHL ears at all frequencies (0.5–6 kHz) during follow-up period (p < 0.05). The threshold change at 4 kHz was 3.2 dBHL higher in SNHL ears which was statistically significant (p < 0.05). When workers were exposed to noise levels of 85 dBA and above, threshold change at 4 kHz was 5.6 dBHL higher in SNHL ears which was statistically significant (p < 0.05). Among workers aged below 50, the threshold change values were lower in low-frequency (0.5–2 kHz) in SNHL ears, with a small range of changes, whereas in high-frequency (3–6 kHz), the range of changes was greater SNHL ears (p < 0.05). Among workers aged 50 and above, SNHL ears showed a wider range of changes in both high- and low-frequency areas (p < 0.05).

Conclusions

At high-frequencies, particularly at 4 kHz, the range of hearing threshold changes was lower in ears with conductive hearing loss than in contralateral ears. This is suggested as a protective effect against noise exposure.

Citations

Citations to this article as recorded by

The interplay of occupational noise-induced hearing loss and middle ear disorders: towards comprehensive hearing conservation in Africa
K Khoza-Shangase, B Sebothoma
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Hyejeong Hong, David W. Dowdy, Kelly E. Dooley, Howard W. Francis, Chakra Budhathoki, Hae-Ra Han, Jason E. Farley
American Journal of Audiology.2020; 29(2): 199. CrossRef

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Erratum

Erratum to: The relationship between quality of sleep and night shift rotation interval: Jae Youn Kim, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Soon Kwon; Ann Occup Environ Med 2016;28:6. Published online January 25, 2016; DOI: https://doi.org/10.1186/s40557-016-0090-7

PDF

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Research Article

The relationship between quality of sleep and night shift rotation interval: Jae Youn Kim, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Sun Il Kwon; Ann Occup Environ Med 2015;27:31. Published online December 17, 2015; DOI: https://doi.org/10.1186/s40557-015-0084-x

Abstract PDF

Background

Shift work is closely related with workers' health. In particular, sleep is thought to be affected by shift work. In addition, shift work has been reported to be associated with the type or direction of shift rotation, number of consecutive night shifts, and number of off-duty days. We aimed to analyze the association between the night shift rotation interval and the quality of sleep reported by Korean female shift workers.

Methods

In total, 2,818 female shift workers from the manufacturing industry who received an employee physical examination at a single university hospital from January to August in 2014 were included. Subjects were classified into three groups (A, B, and C) by their night shift rotation interval. The quality of sleep was measured using the Korean version of the Pittsburgh Sleep Quality Index (PSQI). Descriptive analysis, univariate logistic regression, and multivariate logistic regression were performed.

Results

With group A as the reference, the odds ratio (OR) for having a seriously low quality of sleep was 1.456 (95% CI 1.171–1.811) and 2.348 (95% CI 1.852–2.977) for groups B and C, respectively. Thus, group C with the shortest night shift rotation interval was most likely to have a low quality of sleep. After adjustment for age, obesity, smoking status, alcohol consumption, exercise, being allowed to sleep during night shifts, work experience, and shift work experience, groups B and C had ORs of 1.419 (95% CI 1.134–1.777) and 2.238 (95% CI 1.737–2.882), respectively, compared to group A.

Conclusion

Our data suggest that a shorter night shift rotation interval does not provide enough recovery time to adjust the circadian rhythm, resulting in a low quality of sleep. Because shift work is influenced by many different factors, future studies should aim to determine the most optimal shift work model and collect accurate, prospective data.

Citations

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Hande Pelin Seven, Seda Çiftçi
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Research Article

Association between serum vitamin D and depressive symptoms among female workers in the manufacturing industry: Soon Il Kwon, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Jun Ick Jung; Ann Occup Environ Med 2015;27:28. Published online December 12, 2015; DOI: https://doi.org/10.1186/s40557-015-0083-y

Abstract PDF

Background

Vitamin D has been known to maintain the body’s balance of calcium and phosphorus as well as skeletal health. There has been increasing emphasis on the importance of vitamin D as recent studies have been reporting the specific functions of vitamin D in the cerebral nervous system and the association between the level of serum vitamin D and depressive symptoms. However, there is currently a paucity of research investigating the association between serum vitamin D and depressive symptoms in Korean subjects. Consequently, this study has aimed to determine the level of serum vitamin D and explore the association between serum vitamin D and depressive symptoms in Korean female workers.

Method

A medical examination, questionnaire, anthropometric measurements, and a blood test were conducted between February 3 and March 7, 2014 in 1054 subjects among female workers in the manufacturing industry who underwent physical examinations in a university hospital. From this data, we identified the level of serum vitamin D and investigated the association between serum vitamin D deficiency and depressive symptoms.

Results

The average serum vitamin D level of the 1054 subjects was 9.07 ± 3.25 ng/mL, and the number of subjects in the serum vitamin D deficiency group with less than 10 ng/mL was 721 (68.4 %). The odds ratio of the depressive symptom group with a CES-D score of 16 or above being in the deficiency group with a serum vitamin D level less than 10 ng/mL was found to be 1.55 (95 % CI = 1.15–2.07).

Conclusion

68.4 % of female workers in the manufacturing industry were in the deficiency group with serum vitamin D levels less than 10 ng/mL. Additionally, we identified an association between serum vitamin D deficiency and depressive symptoms. In the future, if serum vitamin D deficiency is checked regularly in workers, we expect to achieve better outcomes in managing their depressive symptoms.

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Ingrid Stähler Kohl, Anderson Garcez, Janaína Cristina da Silva, Harrison Canabarro de Arruda, Vera Maria Vieira Paniz, Maria Teresa Anselmo Olinto
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Won Ju Hwang, Jin Ah Kim, Sally H. Rankin
International Journal of Environmental Research and Public Health.2017; 14(12): 1465. CrossRef

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Research Article

Anxiety symptoms and occupational stress among young Korean female manufacturing workers: Kang Ho Lee, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja-Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Saeng Jung; Ann Occup Environ Med 2015;27:24. Published online November 14, 2015; DOI: https://doi.org/10.1186/s40557-015-0075-y

Abstract PDF

Background

The prevalence of anxiety disorders has been increasing in South Korea, with recent studies reporting anxiety disorders as the most common mental disorder among all South Korean females. Anxiety disorders, which are independent risk factors of suicidal ideation and suicide attempts, are significantly correlated with productivity loss, high medical costs, impaired work performance, and frequent worker absence, and thus are potentially serious problems affecting the health of South Korean female workers. In previous studies, anxiety disorders were shown to have a significant correlation with occupational stress. This study seeks to examine the prevalence of anxiety symptoms as well as the relationship between occupational stress and anxiety symptoms among South Korean female manufacturing workers.

Methods

A structured self-reported questionnaire was administered to 1,141 female workers at an electrical appliance manufacturing plant. The questionnaire collected data on general characteristics, health behaviors, sleep quality, job characteristics (shift work, shift work schedule, and job tenure), occupational stress, and anxiety symptoms. Sleep quality was measured using the Pittsburgh Sleep Quality Index, occupational stress with the Korean Occupational Stress Scale-Short Form (KOSS-SF), and anxiety symptoms with the Korean version of the Beck Anxiety Inventory. A chi square test was conducted to determine the distribution differences in anxiety symptoms based on general characteristics, health behaviors, job characteristics, and sleep quality. A linear-by-linear association test was used to determine the distribution differences between anxietysymptoms and the levels of occupational stress. Last, logistic regression analysis was used in order to determine the association between occupational stress and anxiety symptoms.

Results

The prevalence of anxiety symptoms was 15.2 %. In the multivariate logistic regression analysis that adjusted for sleep quality and general characteristics, a significantassociation was found for those with anxiety disorders; the odds ratios (OR) were significantly higher the greater the total KOSS-SF score (moderate-risk group OR=2.85, 95 % CI=1.79–4.56; high-risk group OR=5.34, 95 % CI=3.59–7.96). In addition, excluding insufficient job control, all other KOSS-SF subscales were significantly associated with anxiety symptoms, and a relatively high OR was seen in the high-risk group for job demand (OR=3.19, 95 % CI=2.27–4.49), job insecurity (OR=4.52, 95 % CI=2.86–7.13), and occupational culture (OR=4.52, 95 % CI=2.90–7.04).

Conclusion

There was a significant association between anxiety symptoms and occupational stress stemming from the psychosocial work environment among these South Korean female manufacturing workers. Future longitudinal studies are needed to examine the association between the occupational stress caused by the psychosocial work environment and the incidence of anxiety disorders and anxiety symptoms. Furthermore, intervention programs that aim to address the prevalence of anxiety symptoms and improve the psychosocial work environment, especially for younger female manufacturing workers, are needed.

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Research Article

The relationship between depressive symptoms among female workers and job stress and sleep quality: Ho-Sung Cho, Young-Wook Kim, Hyoung-Wook Park, Kang-Ho Lee, Baek-Geun Jeong, Yune-Sik Kang, Ki-Soo Park; Ann Occup Environ Med 2013;25:12. Published online July 22, 2013; DOI: https://doi.org/10.1186/2052-4374-25-12

Abstract PDF

Objective

Recently, workers' mental health has become important focus in the field of occupational health management. Depression is a psychiatric illness with a high prevalence. The association between job stress and depressive symptoms has been demonstrated in many studies. Recently, studies about the association between sleep quality and depressive symptoms have been reported, but there has been no large-scaled study in Korean female workers. Therefore, this study was designed to investigate the relationship between job stress and sleep quality, and depressive symptoms in female workers.

Methods

From Mar 2011 to Aug 2011, 4,833 female workers in the manufacturing, finance, and service fields at 16 workplaces in Yeungnam province participated in this study, conducted in combination with a worksite-based health checkup initiated by the National Health Insurance Service (NHIS). In this study, a questionnaire survey was carried out using the Korean Occupational Stress Scale-Short Form(KOSS-SF), Pittsburgh Sleep Quality Index(PSQI) and Center for Epidemiological Studies-Depression Scale(CES-D). The collected data was entered in the system and analyzed using the PASW (version 18.0) program. A correlation analysis, cross analysis, multivariate logistic regression analysis, and hierarchical multiple regression analysis were conducted.

Results

Among the 4,883 subjects, 978 subjects (20.0%) were in the depression group. Job stress(OR=3.58, 95% CI=3.06-4.21) and sleep quality(OR=3.81, 95% CI=3.18-4.56) were strongly associated with depressive symptoms. Hierarchical multiple regression analysis revealed that job stress displayed explanatory powers of 15.6% on depression while sleep quality displayed explanatory powers of 16.2%, showing that job stress and sleep quality had a closer relationship with depressive symptoms, compared to the other factors. The multivariate logistic regression analysis yielded odds ratios between the 7 subscales of job stress and depressive symptoms in the range of 1.30-2.72 and the odds ratio for the lack of reward was the highest(OR=2.72, 95% CI=2.32-3.19). In the partial correlation analysis between each of the 7 subscales of sleep quality (PSQI) and depressive symptoms, the correlation coefficient of subjective sleep quality and daytime dysfunction were 0.352 and 0.362, respectively.

Conclusion

This study showed that the depressive symptoms of female workers are closely related to their job stress and sleep quality. In particular, the lack of reward and subjective sleep factors are the greatest contributors to depression. In the future, a large-scale study should be performed to augment the current study and to reflect all age groups in a balanced manner. The findings on job stress, sleep, and depression can be utilized as source data to establish standards for mental health management of the ever increasing numbers of female members of the workplace.

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Research Article

Relationship of cigarette smoking and hearing loss in workers exposed to occupational noise: Joo Hyun Sung, Chang Sun Sim, Choong-Ryeol Lee, Cheol-In Yoo, Hun Lee, Yangho Kim, Jiho Lee; Ann Occup Environ Med 2013;25:8. Published online July 3, 2013; DOI: https://doi.org/10.1186/2052-4374-25-8

Abstract PDF

Objectives

To investigate the effects of smoking on hearing loss among workers exposed to occupational noise.

Methods

From the results of a special workers health examination performed in 2011, we enrolled 8,543 subjects exposed to occupational noise and reviewed the findings. Using self-reported questionnaires and health examination results, we collected data on age, smoking status, disease status, height, weight, and biochemistry and pure tone audiometry findings. We divided the workers into 3 groups according to smoking status (non-smoker, ex-smoker, current smoker). Current smokers (n = 3,593) were divided into 4 groups according to smoking amount (0.05–9.9, 10–19.9, 20–29.9, ≥30 pack-years). We analyzed the data to compare hearing thresholds between smoking statuses using analysis of covariance (ANCOVA) after controlling for confounder effects.

Results

According to ANCOVA, the hearing thresholds of current smokers at 2 k, 3 k, and 4 kHz were significantly higher than that of the other groups. Multiple logistic regression for smoking status (reference: non-smokers) showed that the adjusted odds ratios of current smokers were 1.291 (95% confidence interval [CI]: 1.055–1.580), 1.180 (95% CI: 1.007–1.383), 1.295 (95% CI: 1.125–1.491), and 1.321 (95% CI: 1.157–1.507) at 1 k, 2 k, 3 k, and 4 kHz, respectively. Based on smoking amount, the adjusted odds ratios were 1.562 (95% CI: 1.013–2.408) and 1.643 (95% CI: 1.023–2.640) for the 10–19.9 and ≥30 pack-years group, respectively, at 1 kHz (reference: 0.05–9.9 pack-years). At 2 kHz, the adjusted odds ratios were increased statistically significantly with smoking amount for all groups. At all frequencies tested, the hearing thresholds of noise-exposed workers were significantly influenced by current smoking, in particular, the increase of hearing loss at low frequencies according to smoking amount was more prevalent.

Conclusions

Current smoking significantly influenced hearing loss at all frequencies in workers exposed to occupational noise, and heavier smoking influenced low-frequency hearing loss more greatly. There was a dose–response relationship between smoking amount and low-frequency hearing thresholds; however, this was not observed for high-frequency hearing thresholds. Therefore, well-designed prospective studies are needed to clarify the effects of smoking on the degree of hearing loss.

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Original Article

The Characteristics of Tinnitus and Hearing Threshold: In Workers with Noise Induced Hearing Loss from a Hospital Setting: Nam Jeong Kim, Hyoung Ouk Park, Chang Sun Sim, Choong Ryeol Lee, Young Joo Kwon, Ji Ho Lee; Korean Journal of Occupational and Environmental Medicine 2012;24(4):431-440. Published online December 31, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.4.431

Abstract PDF

OBJECTIVES
This study was carried out to define the relationship between the characteristics of tinnitus and hearing threshold (puretone and speech) in workers with noise induced hearing loss (NIHL).
METHODS
A total of 189 cases(378 ears) from workers with compensation claims for NIHL during 2004-2009 were investigated. Various factors, including age, work carriers, body mass index (BMI), blood pressure, noise exposure level of worksite hearing threshold, speech discrimination score, pitch match, and loudness of tinnitus were analyzed.
RESULTS
The average hearing threshold of all subject was 44.2 dBHL, puretone audiometry thresholds in subjects with tinnitus were lower than the non-tinnitus group (except at 8000 Hz). Using speech audiometry, the tinnitus group showed a lower speech recognition threshold and speech discrimination score. The tinnitus group also had an average tinnitus frequency of 4195.2 Hz, loudness of 73.6 dB, and tinnitus sensation average of 6.0 dBSL. These frequencies of tinnitus were in the lowest puretone audiometry frequencies. Tinnitus loudness had a strong relationship with puretone and speech audiometry thresholds.
CONCLUSIONS
In cases beyond moderate hearing loss, the tinnitus group had a better puretone (except 8000 Hz) and speech hearing status, and most comfortable loudness (MCL) level. In addition, puretone and speech audiometry thresholds increase with tinnitus loudness.

Citations

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Original Article

The General Characteristics and Results of the Cold Provocation Test in the Risk Group of HAVS: Jae Kook Yoon, Chang Sun Sim, Myoung Soon Oh, Joo Hyun Sung, Ji Ho Lee, Choong Ryeol Lee, Yangho Kim, Cheol In Yoo, Hun Lee; Korean Journal of Occupational and Environmental Medicine 2012;24(3):207-216. Published online September 30, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.3.207

Abstract PDF

OBJECTIVES
The cold provocation test for diagnosing the vascular component in hand-arm vibration syndrome (HAVS) is likely to be accepted as an objective test, and a few studies have been performed. However, controversy has continued regarding the diagnostic performance of this method. Although objective methods such as plethysmography and laser doppler flowmetry have been studied, they have not received as much attention as other diagnostic methods. Therefore, our study aim was to spread the awareness of HAVS by reporting the results of the cold provocation test in a hand-transmitted vibration exposure group.
METHODS
The study subjects were 549 workers who had been exposed to hand-transmitted vibrations and reported symptoms in their hands. While the subject immersed both their hands in 10degrees C water for 10 minutes, the skin temperature of 10 fingers was recorded from pre-immersion time to 20 minute postimmersion including 10 minutes immersion time. The recovery rates were calculated from the recorded skin temperatures. The 'decreased recovery rate' criteria were less than 30% at 5 minutes post-immersion and 60% at 10 minute post-immersion.
RESULTS
Of the subjects, 69.1% and 30.9% had more severe symptoms in the right and left hands, respectively. The mean finger skin temperature of the right hand after cold-water immersion for 10 minutes was approximately 10degrees C, which increased gradually with time, but they did not reach the baseline temperature at 20 minutes post-immersion. The deviations of the skin temperature in the subjects were higher in the recovery phase than in the baseline and cold immersion phase. The 3rd finger of both hands showed the lowest 5-minute recovery rate among the fingers examined, and the left 4th finger and right 3rd finger showed the lowest 10-minute recovery rate. Of the subjects, 37.6% and 10.4% of subjects showed a lower recovery rate at 5 and 10 minutes in at least one finger, respectively, while 10.2% showed a lower recovery rate at both 5 and 10 minutes simultaneously in at least one finger.
CONCLUSIONS
The larger deviations in the recovery phase than in the other phases indicated that interindividual differences are more prominent in the recovery phase. There might be no benefit in observing the finger skin temperature for an additional 10 minutes after 10 minutes post-immersion. Overall, approximately 10% of the subjects in the HAVS risk group had HAVS.

Citations

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Technetium-99m hand perfusion scintigraphy (Raynaud’s scan) as a method of verification in hand arm vibration syndrome: a review
Taewoong Ha, Hyeoncheol Oh, Jungwon Kim
Annals of Occupational and Environmental Medicine.2022;[Epub] CrossRef
Trend of Human Vibration Research in Korea
Hee-Sok Park
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Case Report

Two Case of Erythroleukemia and Myelodysplastic Syndrome in a Non-Destructive Inspector: Myoung Soon Oh, Jae Kook Yoon, Hyun Soo Kim, Hawk Kim, Jin Kyung Lee, Ji Ho Lee, Yang Ho Kim; Korean Journal of Occupational and Environmental Medicine 2011;23(4):471-479. Published online December 31, 2011; DOI: https://doi.org/10.35371/kjoem.2011.23.4.471

Abstract PDF

BACKGROUND
Ionizing radiation is a group 1 carcinogen according to the IARC(International Agency for Research on Cancer) classification. With the development of the radiation related industry, the number of radiation exposed workers has been increasing. There have been several reports on AML(Acute Myeloid Leukemia) on exposure to ionizing radiation; however, there are no reports of occupational malignant lymphohematopoietic disease related to non-destructive inspection.
CASE
REPORT 1: A 35-years-old male, who had worked for 10 years in non-destructive inspection, was diagnosed with myelodysplastic syndrome. He worked 8 hours a day, for three weeks per months, where he was exposed to 192Ir and 60Co radiation sources. Because he had not worn a film badge for monitoring his radiation exposure dose, the accurate exposure dose was not reported. The estimate exposure dose calculated via a chromosomal study was 1.20 Gy, which exceed the dose limits of Korean radiation dose standards, which are 50 and 100 mSv annually and quinquennially respectively.
CASE
REPORT 2: A 26-years-old male, who had worked for 2.5 years in the same company was also diagnosed with myelodysplastic syndrome.
CONCLUSION
Non-destructive inspection is the main source of ionizing radiation in the workplace, which could be the cause of malignant lymphohematopoietic diseases. Therefore, more practical plans and guidelines are needed to prevent non-destructive inspectors from workplace radiation exposure.

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Younghyun Lee, Songwon Seo, Young Woo Jin, Seongjae Jang
Journal of Radiological Protection.2020; 40(1): 151. CrossRef
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Eun-A Kim, Eujin Lee, Seong-Kyu Kang, Meeseon Jeong
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
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Ji-Sung Ahn, Jai-Dong Moon, Wonyang Kang, Hyeong-Min Lim, Seunghyeon Cho, Dae-Young Lim, Won-Ju Park
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
Consecutive results of blood cell count and retrospective biodosimetry: useful tools of health protection regulation for radiation workers
Seongjae Jang, Jin Kyung Lee, Minsu Cho, Su San Yang, Seung Hyun Kim, Wan Tae Kim
Occupational and Environmental Medicine.2016; 73(10): 694. CrossRef
Retrospective biodosimetry using translocation frequency in a stable cell of occupationally exposed to ionizing radiation
Min Su Cho, Jin Kyung Lee, Keum Seok Bae, Eun-Ae Han, Seong Jae Jang, Wi-Ho Ha, Seung-Sook Lee, Joan Francesc Barquinero, Wan Tae Kim
Journal of Radiation Research.2015; 56(4): 709. CrossRef
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Eun-Kyo Chung, Kab-Bae Kim, Se-Wook Song
Journal of Korean Society of Occupational and Environmental Hygiene.2015; 25(1): 27. CrossRef
Physical Agents and Occupational Disease Compensation: Noise, Vibration, Radiation, and Other Physical Agents
Jiho Lee, Jungwon Kim
Journal of Korean Medical Science.2014; 29(Suppl): S72. CrossRef

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Original Article

Effect of Hand Transmitted Vibration on the Auditory System: Jae Kook Yoon, Cheol In Yoo, Ji Ho Lee; Korean Journal of Occupational and Environmental Medicine 2011;23(1):18-30. Published online March 31, 2011; DOI: https://doi.org/10.35371/kjoem.2011.23.1.18

Abstract PDF

OBJECTIVES
This study was undertaken to estimate the effect of hand transmitted vibration exposure for long time period on the auditory system in shipyard grinder workers.
METHODS
From 2006 to 2009, the study was carried out on 87 grinder workers for hand transmitted vibration exposure group, with 81 welders who were served as the control group. All subjects were male; at baseline, none of the participants had ear disease or diabetes mellitus. Auditory threshold at different frequencies ranged from 0.25 kHz to 8 kHz for both ear was recorded; the following were also collected from the subjects: age, exposure duration, noise exposure level of investigation year, total cholesterol, systolic/diastolic blood pressure, and smoking history.
RESULTS
In comparison of two groups, mean of age, exposure duration, noise level, total cholesterol, systolic/diastolic blood pressure, smoking rate were not significantly different between the groups. Auditory thresholds of 0.25, 0.5 kHz frequencies in both ear, 1 kHz frequency in right ear, and 8 kHz frequency in left ear were higher in hand-transmitted vibration exposure group than that in the control group at a statistically significant level. After stratification by age 50 years, there were no significant differences between the two groups in less than 50-years old age group, but auditory threshold of 0.25, 0.5, 1 and 8 kHz frequency were significantly different between the two groups in above 50-years old age group. The differences between two groups ranged from 0.4 dB(HL) to 6.7 dB(HL). Multiple linear regression analysis showed that hand transmitted vibration exposure was significant only in 0.25, 0.5 kHz frequency and the regression coefficients of vibration exposure ranged from 3.826 to 5.028 in those frequencies.
CONCLUSIONS
The differences of hearing threshold between two groups only in the 50-years old group were possibly owing to changed peripheral vascular system with autonomic nervous system, and significances only in low frequencies such as 0.25, 0.5 kHz probably mean that hand vibration exposure have been transmitted to auditory organ over long term. Collectively, older people can be more susceptible to hearing loss in the presence of hand transmitted vibration exposure and auditory threshold at low frequency may be more affected by the hand transmitted vibration exposure than high frequency.

Citations

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The Health Effect of Hand Arm Transmitted Vibration
Jung-Wan Koo
Journal of the Ergonomics Society of Korea.2013; 32(4): 303. CrossRef

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1 Crossref

Original Article

The Effect of a Stretching Exercise on Myofascial Pain Syndrome Patients in Small and Medium Sized Industries: Jung Wook Lim, Young Jun Kwon, Tae Won Jang, Jong Heon Lee, In Seok Kim, Sang Cheol Ryu, Jae Hoon Roh, Jong Uk Won, Bong Suk Cha, Chul Ho Lee; Korean Journal of Occupational and Environmental Medicine 2010;22(4):307-315. Published online December 31, 2010; DOI: https://doi.org/10.35371/kjoem.2010.22.4.307

Abstract PDF

OBJECTIVES
This study was conducted to identify the effect of a stretching exercise on myofascial pain syndrome patients that work in small and medium-sized industry.
METHODS
Questionnaires surveys including general characteristics, work-related characteristics, and musculoskeletal symptoms on neck and shoulder area was administered to 393 subjects who worked in small and medium sized industries. Symptomatic workers were examined to identify whether they had myofascial pain syndrome (MPS). Of the 393 subjects, 108 MPS patients performed 6 weeks stretching exercise program. Intensity of pain was estimated with visual analogue scales (VAS). All patients were interviewed to estimate their compliance to stretching exercise program.
RESULTS
Of the 393 workers, 119 workers were diagnosed with MPS of the neck and shoulder. Post-exercise VAS was significantly reduced compared to pre-exercise VAS (p<0.05). High compliance patients to stretching exercise were more effective to exercise therapy (OR 2.89, 95% CI 1.19~7.04), and overtime workers were less effective to exercise therapy (OR 0.41, 95% CI 0.17~0.95).
CONCLUSION
The Stretching exercise program was identified to be effective in MPS patients in small and medium-sized industries. It is recommended that workers with MPS in small and medium-sized industries practice a well-designed stretching exercise program, and avoid overtime work.

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Kwang-Il Kwag, Jae-Heon Lim
Journal of the Korean Academy of Clinical Electrophysiology.2011; 9(2): 39. CrossRef

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Case Report

A Case of Lead Poisoning by Ingesting Herbal Pills Tainted by Lead during the Manufacturing Process: Young Hoo Shin, Jun Seok Son, Young Wook Kim, Chang Ho Chae, Ja Hyeon Kim, Chan Woo Kim, Jun Ho Lee; Korean Journal of Occupational and Environmental Medicine 2010;22(3):271-277. Published online September 30, 2010; DOI: https://doi.org/10.35371/kjoem.2010.22.3.271

Abstract PDF

BACKGROUND
This is a case report of lead poisoning after herbal pill ingestion. We report this case here as a reminder that contamination during the manufacturing process is an important issue regarding herbal pills. Case Report: A 37-year-old male was admitted to the hospital with abdominal pain caused by cholecystitis. He was transferred to the Department of Occupational and Environmental Medicine on 26 December 2008, because of anemia. On follow-up examination post cholecystectomy, the patient had increasing blood lead levels. There was no specific finding in his medical history, but he had been taking herbal pills for 3 months to treat dyspepsia. We performed an analysis on the herbal pills, and determined a lead concentration of 1485 mg/kg. When he was admitted to the hospital, the patient had a blood lead level of 84.13 microgram/dL and a zinc protoporphyrin level was 230 microgram/dL. The patient was treated with 250 mg of Penicillamine, 4 times per day. During follow-up 3 weeks later, the patient's blood lead level had been reduced to 36.52 microgram/dL which allowed us to take him off of Penicillamine. By 7 months follow-up, the patient's blood lead concentration had fallen from 36.52 microgram/dL to 20.93 microgram/dL.
CONCLUSION
Lead poisoning was confirmed by analyzing blood lead levels and the cause was herbal pills. Upon analysis of the herbal pills, we have discovered that the herbal pills contained an amount of lead acquired during the manufacturing process, based on the high levels of this heavy metal in comparison to other metals. Private herbal pill manufacturing plants need systematic management and oversight.

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Collective exposure to lead from an approved natural product-derived drug in Korea
Dae-Young Lim, Won-Yang Kang, Ji-Sung Ahn, Seunghyeon Cho, Suwhan Kim, Jai-Dong Moon, Byung-Chan Lee, Won-Ju Park
Annals of Occupational and Environmental Medicine.2019;[Epub] CrossRef
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Seol Jang, Ah-Reum Lee, A-Eong Lee, Go-Ya Choi, Ho-Kyoung Kim
Korean Journal of Environmental Health Sciences.2015; 41(1): 30. CrossRef

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Original Article

The Concentration of Cadmium in Urine, and Its Role in Health-risk Assessment of Residents in the Vicinity of Abandoned Mines in Gyeongsangbuk-do, Korea: Sung Ho Yun, Chang Yoon Kim, Tae Yoon Hwang, Kyu Chang Won, Jun Young Do, Se Jin Lee, Yeong Mog Park, Kwan Soo Jun, Gae Ho Lee, Do Young Lee, Kwang Seub Park, Joon Sakong; Korean Journal of Occupational and Environmental Medicine 2010;22(3):251-261. Published online September 30, 2010; DOI: https://doi.org/10.35371/kjoem.2010.22.3.251

Abstract PDF

OBJECTIVES
This study was conducted to assess the concentration of urine cadmium and health risks of residents in the vicinity of abandoned metal mines in Gyeongsangbuk-do.
METHODS
The concentration of cadmium in the soil, water, and agricultural crops was measured in Gyeongsangbuk-do, Butdeun and Suksan, which have abandoned metal mines. We measured the concentration of cadmium in the urine of residents from the following areas: 78 from village A, 99 from village C and 147 from control areas. Other health-risk assessments were performed on each resident, such as measuring the concentration of beta2-MG and a bone density test.
RESULTS
In abandoned mine areas, the mean concentration of cadmium was higher in agricultural soil and in the crops than in that of control areas. The concentration of cadmium in the stream exceeded the guideline level. In regard to provisional tolerable daily intake (PTDI) of cadmium, the actual intake rate through crops was 33.81%, 72.74% in abandoned mine areas and 5.03%, 6.16% in control areas. Residents in abandoned mine areas, A village and C village had a geometric mean of urine Cd of 1.90 microgram/g cr and 1.45 microgram/g cr. These measurements were significantly higher than those of residents in control areas, B village and D village, 0.59 microgram/g cr and 0.65 microgram/g cr (p<0.01). Following adjustments for age, sex, smoking habit, and occupational history, the concentration of urine cadmium of residents in the Butdeun abandoned meta mine was higher by 1.62 microgram/g cr as compared with the control group (p<0.01). Residents from the Suksan abandoned metal mine also had a higher concentration by 1.07 microgram/g cr (p<0.01). A multiple linear regression analysis was performed for the factors associated with T-score, and this showed that the concentration of urine cadmium was not an influential factor.
CONCLUSIONS
Based on these measurements, areas with abandoned metal mines contaminated streams, agricultural soil, and crops of the adjacent areas, with cadmium. Because residents in the adjacent areas intake contaminated crops, their urine cadmium was increased. Despite a lack of evidence demonstrating the detrimental effect of increased urine cadmium in residents, an additional study is needed to assess the health risks of residents in the vicinity of abandoned metal mines.

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