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Hee-Tae Kang 15 Articles
Special Article
Occupational stress (KOSS®19): scale development and validation in the Korean context
Hansoo Song, Hyoung Ryoul Kim, Inah Kim, Jin-Ha Yoon, Sang-Baek Koh, Sung-Soo Oh, Hee-Tae Kang, Da-Yee Jeung, Dae-Sung Hyun, Chunhui Suh, Sei-Jin Chang
Ann Occup Environ Med 2025;37:e12.   Published online May 7, 2025
DOI: https://doi.org/10.35371/aoem.2025.37.e12
AbstractAbstract AbstractAbstract in Korean PDFSupplementary Material
Background
The Korean Occupational Stress Scale (KOSS) was developed in 2004. During this time, industrial structures have evolved, and societal awareness of occupational stress has changed. This study aims to develop and validate a revised version of the Korean Occupational Stress Scale (KOSS®19), tailored for workers, reflecting these changes.
Methods
The KOSS®19 was developed based on the 26-item KOSS–short form (SF) through a review by eight experts. A survey was conducted including 359 service industry workers, comprising the KOSS®19, Burnout, and Depression scales. The KOSS®19 subscales were restructured, and their reliability and validity were evaluated.
Results
The KOSS®19 composed of eight subscales: hazardous physical environment (2 items), high job demand (3 items), insufficient job control (2 items), low social support (2 items), job insecurity (2 items), organizational injustice (4 items), lack of reward (2 items), and work-life imbalance (2 items). The reliability and validity of the KOSS®19 were found to be satisfactory.
Conclusions
The KOSS®19 is a suitable tool for assessing occupational stress, effectively replacing the original KOSS and KOSS-SF.
직무 스트레스: 한국적 맥락에서의 척도 개발 및 타당화
목적
한국형 직무스트레스 척도(KOSS)가 2004년에 개발된 이후 산업 구조가 변화하고 직무 스트레스에 대한 사회적 인식도 달라졌다. 본 연구는 이러한 변화를 반영하여 한국형 직무스트레스 척도 개정판(KOSS®19)을 개발하고 타당성을 검증하는 것을 목적으로 한다.
방법
KOSS®19는 기존의 26문항 KOSS-SF를 기반으로 8명의 전문가 검토를 거쳐 개발되었다. 서비스업 종사자 359명을 대상으로 KOSS®19, 소진(Burnout) 척도, 우울 척도를 포함한 설문조사를 실시하였으며, KOSS®19의 요인을 재구성하고 신뢰도 및 타당도를 평가하였다.
결과
KOSS®19는 8개 요인으로 구성되었다: 위해물리환경(2문항), 높은직무요구 (3문항), 직무자율성결여(2문항), 낮은사회적지지(2문항), 직업불안정(2문항), 조직불공정(4문항), 보상부적절(2문항), 일-삶의불균형 (2문항). KOSS®19의 신뢰도 및 타당도는 만족할 만한 수준으로 확인되었다.
결론
KOSS®19는 직무 스트레스를 평가하는 데 적절한 도구로, 기존 KOSS 및 KOSS-SF를 효과적으로 대체할 수 있다.
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Special Article
Emotional labor (KELS®11): scale development and validation in the Korean context
Da-Yee Jeung, Hyoung Ryoul Kim, Hansoo Song, Inah Kim, Jin-Ha Yoon, Sang-Baek Koh, Sung-Soo Oh, Hee-Tae Kang, Dae-Sung Hyun, Chunhui Suh, Sei Jin Chang
Ann Occup Environ Med 2025;37:e13.   Published online May 7, 2025
DOI: https://doi.org/10.35371/aoem.2025.37.e13
AbstractAbstract AbstractAbstract in Korean PDFSupplementary Material
Background
Emotional labor refers to the management of emotions and expressions to meet the emotional requirements of a job role. This study aimed to develop a revised version of the Korean Emotional Labor Scale (KELS®11), based on the first edition (KELS-24) introduced in 2014, and to provide practical applications and guidelines for its use in the Korean workplace through a validation process.
Methods
The revised version of KELS®11 was derived from the 24-item KELS, following a review process involving eight experts. To validate the scale’s reliability and validity, a self-administered survey was conducted among 359 service industry workers using KELS®11, burnout, and depression scales. KELS®11 was reclassified, and its reliability and validity were evaluated. Receiver operating characteristic curve analysis was conducted to establish sex-specific cutoff values (normal vs. high-risk groups).
Results
KELS®11 was designed to account for individual, organizational, and cultural contexts. It consists of four subscales and 11 items: “emotional regulation” (2 items), “emotional dissonance” (3 items), “organizational monitoring” (2 items), and “organizational protective system for emotional labor” (4 items). KELS®11 demonstrated good validity (content validity ratio: 0.84; item convergence/discriminant validity success rates: 100%; correlation with burnout: r = 0.185–0.436, p < 0.01; correlation with depression: r = 0.128–0.339, p < 0.05) and reliability (Cronbach’s alpha: 0.597–0.795). Additionally, sex-specific reference values were established to determine risk groups based on the intensity of emotional labor exposure.
Conclusions
KELS®11 is a validated and reliable measurement tool designed to assess the intensity and magnitude of emotional labor in the workplace. The revised tool reflects critical considerations in the development of emotional labor measurement scales.
감정노동: 한국적 맥락에서의 척도 개발 및 유용성 평가
목적
감정노동은 직무수행과정에서 조직 및 일에 요구되는 역할을 충족하기 위해 감정과 표현을 관리하는 것을 의미한다. 본 연구는 2014년 개발된 제1판(KELS-24)을 기반으로 한국형 감정노동 측정도구 개정판 (KELS®11)을 개발하고, 유용성 평가 과정을 통해 직장에서의 활용을 위한 실무적용과 평가지침을 제공하는 데 그 목적이 있다.
방법
KELS 11의 개정판은 8명의 전문가가 참여한 검토 과정을 거쳐 24개 항목으로 구성된 KELS®24를 토대로 구축되었다. 측정도구의 신뢰성과 타당성을 검증하기 위해 KELS®11, 소진 및 우울증 척도를 사용하여 359명의 서비스 산업 종사자를 대상으로 유용성 평가를 수행하여 재 분류하였고, 그 신뢰성과 타당성을 평가하였다. ROC(Receiver Operating Characteristic) 분석을 수행하여 성별 참고치(정상 대 고위험군)를 제시하였다.
결과
KELS®11은 개인, 조직, 문화적 맥락을 고려하여 설계되었다. '감정규제'(2문항), '감정부조화'(3문항), '조직모니터링'(2문항), '감정노동보호체계'(4문항) 등 4개의 하위 척도와 11개 항목으로 구성되어 있다. KELS®11은 우수한 타당도(CVR: 0.84; 문항 수렴/판별 타당성 성공률: 100%; 소진과의 상관관계: r=0.185–0.436, p < 0.01; 우울증과의 상관관계: r=0.128–0.339, p < 0.05) 및 신뢰도(Cronbach’s α: 0.597–0.795)을 보여주었다. 또한, 감정노동 노출 강도에 따라 위험군을 결정하기 위해 성별에 따른 참고치를 제시하였다.
결론
KELS®11은 업무수행과정에서 경험하는 감정노동의 강도와 규모를 평가하기 위해 감정노동 측정척도 개발에 필수적인 중요한 고려 사항을 반영하여 개발되어진 검증되고 신뢰할 수 있는 측정도구이다.
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Special Article
Workplace Violence (KWVS®13): scale development and validation in the Korean context
Da-Yee Jeung, Hyoung Ryoul Kim, Hansoo Song, Inah Kim, Jin-Ha Yoon, Sang-Baek Koh, Sung-Soo Oh, Hee-Tae Kang, Dae-Sung Hyun, Chunhui Suh, Sei-Jin Chang
Ann Occup Environ Med 2025;37:e14.   Published online May 7, 2025
DOI: https://doi.org/10.35371/aoem.2025.37.e14
AbstractAbstract AbstractAbstract in Korean PDFSupplementary Material
Background
Workplace violence refers to any act or threat of physical violence, verbal abuse, harassment, intimidation, bullying, mobbing, or other aggressive and disruptive behaviors that occur at work. This study aims to develop and validate a revision of the Korean Workplace Violence Scale (KWVS®13), based on the first edition of the Korean Workplace Violence Scale (KWVS-24), and to provide practical applications and guidelines for the Korean workplace environment.
Methods
The revised KWVS®13 was developed by restructuring the 24-item KWVS through a review process involving eight experts. To validate the reliability and validity of KWVS®13, a self-administered survey comprising KWVS®13, burnout, and depression scales was conducted among 359 service industry workers. KWVS®13 was reclassified, and its reliability and validity were assessed. Receiver operating characteristic curve analysis was performed to establish sex-specific cutoff values (normal vs. risk) of the scale.
Results
KWVS®13 consists of 13 items across four subscales: “psychological and sexual violence from customers” (4 items), “psychological and sexual violence from supervisors or coworkers” (4 items), “physical assault from customers, supervisors, or coworkers” (2 items), and “organizational protective system for workplace violence” (3 items). We found that KWVS®13 shows relatively good validity (content validity ratio for content validity: 0.888; success rate of item convergent and discriminant validity: 100%, and significant correlation coefficient with burnout (r = 0.115–0.83, p < 0.05) and depression (r = 0.098–0.348, p < 0.05) with the exception of Organizational Violence Protection System for Workplace Violence) and reliability (Cronbach’s alpha: 0.827–0.860). The reference values for determining risk groups according to the intensity of exposure to workplace violence are presented separately by sex.
Conclusions
KWVS®13 is a robust and useful measurement tool to objectively and quantitatively assess the intensity and magnitude of workplace violence. It incorporates important considerations for workplace violence assessment and provides a reliable framework for evaluating workplace violence in various professional settings.
직장폭력: 한국적 맥락에서의 척도 개발 및 유용성 평가
배경
직장폭력은 업무수행과정에서 발생하는 신체적 폭력, 언어 폭력, 괴롭힘, 협박, 따돌림, 집단 따돌림 또는 기타 공격적이고 파괴적인 행동의 모든 행위 또는 위협을 의미한다. 본 연구는 한국형 직장폭력 측정도구 제1판 (KWVS-24)을 기반으로 한 한국형 직장내 폭력 척도 개정판 (KWVS®13)을 개발하고 유용성 평가를 통해, 한국의 직장 환경에 대한 실무적용과 활용지침을 제공하는 것을 목적으로 한다.
방법
개정된 KWVS®13은 8명의 전문가가 참여하는 검토 과정을 통해 24개 항목의 KWV-24를 재구성하여 개발되었다. 측정 도구의 신뢰성과 타당성을 검증하기 위해 KWVS®13, 소진 및 우울증 척도를 사용하여 359명의 서비스 산업 종사자를 대상으로 유용성 평가를 수행하여 재 분류하였고, 그 신뢰성과 타당성을 평가하였다. ROC(Receiver Operating Characteristic) 분석을 수행하여 성별 참고치(정상 대 고위험군)를 제시하였다.
결과
KWVS®13은 고객의 정신적/성적 폭력(4개 항목), 직장 내 정신적/성적 폭력(4개 항목), 직장/고객의 신체적 폭행(2개 항목), 폭력 보호체계(3개 항목)의 4개 하위 척도에 걸쳐 13개 항목으로 구성되어 있다. KWVS®13은 상대적으로 양호한 타당도 (CVR: 0.888, 항목 수렴 및 판별 타당성의 성공률: 100%), 소진 (r=.115- .83, p<0.05) 및 우울증(r=.098- .348, p<0.05, 폭력 보호체계 제외) 및 신뢰도 (Cronbach’s α: 0.827 - 0.860)를 보였다. 직장폭력에 대한 노출 강도에 따른 위험군을 결정하기 위한 참고치는 성별에 따라 제시하였다.
결론
KWVS®13은 직장폭력의 강도와 규모를 객관적이고 정량적으로 평가할 수 있는 강력하고 유용한 측정도구로서 직장폭력 평가 시 고려되어야 할 중요 차원들을 반영하여 다양한 직무 환경에서 직장폭력을 정량적으로 평가하기 위한 유용한 측정도구이다.
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Original Article
The risk of insomnia by work schedule instability in Korean firefighters
Saebomi Jeong, Jeonghun Kim, Sung-Soo Oh, Hee-Tae Kang, Yeon-Soon Ahn, Kyoung Sook Jeong
Ann Occup Environ Med 2024;36:e24.   Published online September 10, 2024
DOI: https://doi.org/10.35371/aoem.2024.36.e24
AbstractAbstract AbstractAbstract in Korean PDFSupplementary Material
Background
Firefighters are exposed to shift work, as well as unpredictable emergency calls and traumatic events, which can lead to sleep problems. This study aimed to investigate the risk of insomnia by work schedule instability in Korean firefighters.
Methods
This study used the Insomnia Severity Index to assess the insomnia in firefighters. The work schedule stability was classified with the frequency of the substitute work and the timing of notification for work schedule changes. Logistic regression analysis was used to assess the adjusted odds ratio of insomnia by work schedule stability with covariates including sex, age, education, smoking, alcohol, caffeine intake, shift type, job, and underlying conditions.
Results
Of the 8,587 individuals, 751 (8.75%) had moderate to severe insomnia (Insomnia Severity Index ≥ 15). The prevalence of insomnia was statistically significantly higher as the frequency of substitute work increased: <1 time per month (6.8%), 1–2 times (9.5%), 3–5 times (13.4%), and more than 5 times (15.7%) (p < 0.001). Additionally, the prevalence of insomnia was statistically significantly higher when the timing of the schedule change notification was urgent or irregular: no change or several weeks before (5.4%), several days before (7.9%), one day before or on the day (11.2%), irregularly notification (11.6%) (p < 0.001). In comparison to the group with good frequency of the substitute work/good timing of schedule change notification group, the adjusted odds ratios of insomnia were 1.480 (95% confidence interval [CI]: 1.237–1.771) for Good/Bad group, 1.862 (95% CI: 1.340–2.588) for Bad/Good group, and 1.885 (95% CI: 1.366–2.602) for Bad/Bad group.
Conclusions
Work schedule instability was important risk factor of insomnia in firefighters. It suggests that improving the stability of work schedules could be a key strategy for reducing sleep problems in this occupational group.
한국 교대근무 소방관에서 근무 스케줄 불안정성에 따른 불면증 유병 위험
목적
한국 교대근무 소방관에서 근무 스케줄 불안정성이 불면증 유병 위험을 평가하였다.
방법
한국판 불면증 심각도 평가척도를 이용하여 불면증을 평가하였다. 근무 스케줄 안정성으로는 월별 대체 근무 횟수 및 근무일정 변경 통보 시점으로 분류하였다. 월별 대체 근무 횟수 및 근무일정 변경 통보 시점을 각각 좋음, 나쁨으로 분류하고, 두 요인을 조합하여 좋음/좋음, 좋음/나쁨, 나쁨/좋음, 나쁨/나쁨의 4개 그룹으로 나누었다. 통계분석은 카이제곱검정, t-검정, 로지스틱 회귀 분석을 사용하였다.
결과
8,587명 중 751명(8.75%)은 중등도 이상의 불면증이 있었다. 별 대체근무 일수가 증가할수록, 근무 일정 변화를 미리 고지하지 않을수록 불면증 유병률이 유의하게 높았다. 4개의 그룹으로 나누어 근무 예측 가능성과 불면증의 연관성을 분석한 결과, 대체 근무 빈도가 “좋음”그룹/근무일정 변경 통보 시점이 “좋음” 그룹과 비교하여 불면증의 보정 비차비는 “좋음/나쁨” 그룹은 1.480(95%신뢰구간: 1.237~1.771), “나쁨/좋음” 그룹은 1.862(95% CI: 1.340~2.588), “나쁨/나쁨”그룹은 1.885(95% CI: 1.366~2.602)였다.
결론
근무 스케줄 안정성이 좋지 못할수록 불면증의 위험성이 높았다.

Citations

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  • Mapping Connection and Direction Among Symptoms of Sleep Disturbance and Perceived Stress in Firefighters: Embracing the Network Analysis Perspective
    Bin Liu, Mingxuan Zou, Lin Liu, Zhongying Wu, Yinchuan Jin, Yuting Feng, Qiannan Jia, Mengze Li, Lei Ren, Qun Yang
    Nature and Science of Sleep.2025; Volume 17: 1143.     CrossRef
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Special Issue
Statement by the Korean Society of Occupational and Environmental Medicine on the proposed reform of working hours in South Korea
Hee-Tae Kang, Chul-Ju Kim, Dong-Wook Lee, Seung-Gwon Park, Jinwoo Lee, Kanwoo Youn, Hwan-Cheol Kim, Kyoung Sook Jeong, Hansoo Song, Sung-Kyung Kim, Sang-Baek Koh
Ann Occup Environ Med 2023;35:e17.   Published online July 5, 2023
DOI: https://doi.org/10.35371/aoem.2023.35.e17
AbstractAbstract PDFSupplementary Material

The current 52-hour workweek in South Korea consists of 40 hours of regular work and 12 hours of overtime. Although the average working hours in South Korea is declining, it is still 199 hours longer than the Organisation for Economic Co-operation and Development average of 1,716 hours per year. In view to this, the South Korean government has now proposed to reform the workweek, mainly intending to increase the workweek to 69 hours when the workload is heavy. This reform, by increasing the labor intensity due to long working hours, goes against the global trend of reducing work hours for a safe and healthy working environment. Long working hours can lead to increased cerebrovascular and cardiovascular diseases, industrial accidents, mental health problems, and safety accidents due to lack of concentration. In conclusion, the Korean government’s working hour reform plan can have a negative impact on workers’ health, and therefore it should be thoroughly reviewed and modified.


Citations

Citations to this article as recorded by  
  • Gender differences in the association between long working hours and the onset of depressive symptoms in middle-aged and older workers in Korea: A population-based longitudinal study (2006–2022)
    Seong-Uk Baek, Yu-Min Lee, Jong-Uk Won, Jin-Ha Yoon
    Maturitas.2025; 193: 108175.     CrossRef
  • Occupational disease monitoring by the Korea Occupational Disease Surveillance Center: a narrative review
    Dong-Wook Lee, Inah Kim, Jungho Hwang, Sunhaeng Choi, Tae-Won Jang, Insung Chung, Hwan-Cheol Kim, Jaebum Park, Jungwon Kim, Kyoung Sook Jeong, Youngki Kim, Eun-Soo Lee, Yangwoo Kim, Inchul Jeong, Hyunjeong Oh, Hyeoncheol Oh, Jea Chul Ha, Jeehee Min, Chul
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    Phillip John Tully, Suzanne Cosh, Gary Wittert, Sean Martin, Andrew Vincent, Antonina Mikocka-Walus, Deborah Turnbull
    JMIR Research Protocols.2025; 14: e58655.     CrossRef
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    Seong-Uk Baek, Jin-Ha Yoon
    Journal of Public Health.2025;[Epub]     CrossRef
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    Seong-Uk Baek, Jin-Ha Yoon
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    S.-U. Baek, J.-U. Won, Y.-M. Lee, J.-H. Yoon
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    Seong-Uk Baek, Yu-Min Lee, Jin-Ha Yoon, Jong-Uk Won
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    Seong-Uk Baek, Jong-Uk Won, Jin-Ha Yoon
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Original Article
Risk of insomnia symptoms according to Work-Family Conflict by workers’ characteristics
Kwanghyun Seo, Seungjun Ryu, Saebomi Jeong, Hee-Tae Kang, Sung-Kyung Kim, Sang-Baek Koh, Kyoung Sook Jeong, Sung-Soo Oh
Ann Occup Environ Med 2023;35:e36.   Published online August 23, 2023
DOI: https://doi.org/10.35371/aoem.2023.35.e36
AbstractAbstract AbstractAbstract in Korean PDF
Background

Work-Family Conflict means that the demands of work and family roles cannot be met simultaneously, so one cannot concentrate on one’s work or family role. This conflict can negatively affect mental health and cause insomnia symptoms.

Methods

This study was conducted on 20,442 subjects. Insomnia symptoms were assessed using the Minimal Insomnia Symptom Scale, and other variables were assessed using the questionnaire method. Logistic regression analyses were performed to evaluate the effect of Work-Family Conflict on insomnia symptoms, and subgroup logistic regression analyses were also performed.

Results

The number of people with insomnia symptoms was 4,322 (15.1%). Compared with Low Work-Family Conflict, the odds ratios (ORs) for the risk of insomnia symptoms were 1.84 (95% confidence interval: 1.56–2.16) in High work-to-family conflict, 1.16 (1.02–1.32) in High family-to-work conflict, and 3.19 (2.87–3.55) in High Work-Family Conflict. The ORs were higher for men than women in High WFC but higher for women than men in High Work-Family Conflict.

Conclusions

The risk of insomnia symptoms was highest in High Work-Family Conflict.

근로자 특성별 일-가정 갈등에 따른 불면증 증상의 발생 위험
목적
일-가정 갈등이 근로자의 불면증 증상 발생에 미치는 영향을 확인하고자 한다.
방법
이 연구는 20,442명의 피험자를 대상으로 수행되었다. 불면증 증상은 Minimal Insomnia Symptom Scale을 사용하여 평가하였고, 기타 변수는 설문지 방법을 사용하여 수집하였다. 일-가정 갈등이 불면증 증상 발생에 미치는 영향을 알아보기 위해 로지스틱 회귀 분석을 수행하였으며, 하위그룹 로지스틱 회귀 분석 또한 수행하였다.
결과
불면증이 있는 사람은 4,322명(15.1%)이었다. 전체 일-가정 갈등이 낮은 근로자와 비교했을 때, 불면증 증상 발생에 대한 오즈비는 WFC가 높은 근로자에서 1.84(95% 신뢰 구간 1.56-2.16), FWC가 높은 근로자에서 1.16(95% CI 1.02-1.32), 전체 일-가정 갈등이 높은 근로자에서 3.19(95% CI 2.87-3.55)이었다. 남성과 여성을 나누어 분석했을 때, WFC가 높은 근로자에서는 남성이 여성보다 오즈비가 높았으나 전체 일-가정 갈등이 높은 근로자에서는 여성이 남성보다 오즈비가 높았다.
결론
전체 일-가정 갈등이 높은 근로자에서 불면증 증상의 발생 위험이 가장 컸다.

Citations

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  • Female workers with long working hours are more likely to have depressive symptoms when having family-to-work conflict
    Garin Lee, Ji-Hwan Kim, Seung-Sup Kim
    International Archives of Occupational and Environmental Health.2024; 97(2): 199.     CrossRef
  • Association between long working hours and engagement in preventive healthcare services in Korean workers: Findings from the Korean National Health and Nutrition Examination Survey
    Seong-Uk Baek, Yu-Min Lee, Jin-Ha Yoon
    Preventive Medicine.2024; 180: 107849.     CrossRef
  • Difficulty Falling Asleep, Nocturnal Awakening, Sleep Dissatisfaction, and Irritability in the General Population
    Tetsuya Akaishi
    The Tohoku Journal of Experimental Medicine.2024; 263(4): 261.     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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Research Article
Relationship between job rotation and work-related low back pain: a cross-sectional study using data from the fifth Korean working conditions survey
Ji-Su Shin, Kwanghyun Seo, Hyun-Jeong Oh, MyeongSeob Lim, Hee-Tae Kang, Kyeong-Sook Jeong, Sang-Baek Koh, Sung-Kyung Kim, Sung-Soo Oh
Ann Occup Environ Med 2021;33:e3.   Published online January 28, 2021
DOI: https://doi.org/10.35371/aoem.2021.33.e3
AbstractAbstract PDF
Background

Job rotation was introduced in various industries as a strategic form of work for improving workers' job skills and health management. This study aims to examine the relationship between job rotation and work-related low back pain (LBP), one of the typical work-related musculoskeletal symptoms of Korean workers.

Methods

We conducted this study using the data of the 5th Korean Working Conditions Survey (KWCS). As the subject of this study, 27,163 wage workers were selected, and classified into three groups according to occupational type (white-collar, service and sales, and blue-collar). In this study, job rotation means to change the work-related activities with other colleagues periodically and work-related LBP was defined as whether there was work-related LBP in the last 12 months. Chi-square test and logistic regression were used to analyze the relationship between job rotation and work-related LBP.

Results

Out of 27,163 workers, 2,421 (8.9%) answered that they had job rotation and 2,281 (8.4%) answered that they experienced work-related LBP. According to the results from logistic regression, job rotation was significantly associated with low prevalence of work-related LBP among blue-collar workers (odds ratio [OR]: 0.71, 95% confidence interval [CI]: 0.58–0.88), whereas no significant relationship was observed among white-collar, service and sales groups. In addition, the negative association between job rotation and work-related LBP among blue-collar workers was more pronounced when exposed to ergonomic risk factors (uncomfortable posture OR: 0.79, 95% CI: 0.64–0.98; heavy work OR: 0.74, 95% CI: 0.57–0.96; repetitive work OR: 0.74, 95% CI: 0.60–0.92).

Conclusions

Job rotation was associated with low prevalence of work-related LBP among workers in the blue-collar occupational group in Korea. It is necessary to evaluate the effect of job rotation by occupational type and introduce an appropriate method of job rotation to reduce workers' work-related musculoskeletal symptoms.


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    Kyungran Jung, Jae-Suk Yang
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    Duygu Gulseren
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Research Article
Psychosocial factors affecting sleep quality of pre-employed firefighters: a cross-sectional study
MyeongSeob Lim, Solam Lee, Kwanghyun Seo, Hyun-Jeong Oh, Ji-Su Shin, Sung-Kyung Kim, Hee-Tae Kang, Kyeong-Sook Jeong, Sung-Soo Oh, Sang-Baek Koh, Yeon-Soon Ahn
Ann Occup Environ Med 2020;32:e12.   Published online May 8, 2020
DOI: https://doi.org/10.35371/aoem.2020.32.e12
AbstractAbstract PDF
Background

There have been no health-related studies of pre-employed firefighters without firefighter-specific job-related factors (FSJRF). This study aimed to evaluate the sleep quality of pre-employed firefighters and to examine the relationship between sleep quality and psychosocial factors.

Methods

We conducted a self-report questionnaire survey for 602 pre-employed firefighters at 3 Fire Service Academies after brief lecture about sleep. Sleep quality and psychosocial variables such as depression, anxiety, stress and social support were evaluated. The independent 2 sample t-test, χ2 test and multiple logistic regression analysis were used to evaluate the effect of the variables on the sleep quality of pre-employed firefighters.

Results

Among a total of 602 people, 347 (57.6%) had good sleep quality and 255 (42.4%) had poor sleep quality. Pittsburgh Sleep Quality Index score of them was 3.29 ± 1.41) and 7.87 ± 2.20), respectively. 24 (4.0%) were evaluated to have insomnia by Insomnia Severity Index. Logistic regression analyses showed that the depression (adjusted odds ratio [aOR]: 5.940, 95% confidence interval [CI]: 3.124–11.292), anxiety (aOR: 4.233, 95% CI: 2.138–8.381), stress (aOR: 2.880, 95% CI: 1.915–4.330) and social support (aOR: 0.959, 95% CI: 0.939–0.980) have a significant effect on sleep quality after adjusted by sex, age, smoking status, drinking status, caffeine intake, past shift working and circadian rhythm type.

Conclusions

Depression, anxiety, stress and social support were associated with sleep quality among pre-employed firefighters. Repeated follow-up studies of pre-employed firefighters are needed to further assess their change of sleep quality and identify the FSJRF that may affect the sleep quality of firefighters.


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    Nunnapat Piyachaiseth, Pornchai Sithisarankul, Jate Ratanachina
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Research Article
Relationship between shift work and liver enzymes: a cross-sectional study based on the Korea National Health and Examination Survey (2007–2015)
Hyeongyeong Choi, Hyun-Jeong Oh, Ji-Su Shin, MyeongSeob Lim, Sung-Kyung Kim, Hee-Tae Kang, Sung-Soo Oh, Sang-Baek Koh
Ann Occup Environ Med 2019;31:e15.   Published online July 31, 2019
DOI: https://doi.org/10.35371/aoem.2019.31.e15
AbstractAbstract PDF
Background

Shift work has well-known adverse effects on health. However, few studies have investigated the relationship between shift work and hepatic disorders. This study aimed to evaluate the association between shift work and abnormal level of liver enzymes.

Methods

The aggregated data from the 2007–2009, 2010–2012, and 2013–2015 cycles of the Korea National Health and Nutrition Examination Survey was used for this study. The χ2 test and multiple logistic regression analysis were used to assess relationship between shift work and abnormal level of liver enzymes stratified by gender.

Results

The odds ratio (OR) of abnormal serum level of alanine aminotransferase (abnormal ALT) in female shift workers was higher with 1.31 (95% confidence interval: 1.00–1.71) compared with day workers after adjusting for covariates. After dividing into subgroups of the shift work pattern, the ORs of abnormal liver enzymes for each pattern compared with day work were not significantly higher.

Conclusions

This study provides limited support for the hypothesis that shift work is related to liver enzyme abnormalities, but offers some evidence in favor of the idea that shift work affects female workers more than males on abnormal ALT. Further studies are needed to define the relationship between shift work and abnormal liver enzymes to be carried out as well as the gender difference in the association.


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    F Yu, J Liu, T Qu, M Zhao, J Wang, S Jiang, L Ge, F Ye, L Liu, Z He, S Zhang
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    International Archives of Occupational and Environmental Health.2023; 96(1): 179.     CrossRef
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    Annals of Occupational and Environmental Medicine.2022;[Epub]     CrossRef
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Research Article
Relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain: a cross-sectional study based on the fourth Korean working conditions survey
Jae-Yeop Kim, Ji-Su Shin, Myeong-Seob Lim, Hyeon-Gyeong Choi, Sung-Kyeong Kim, Hee-Tae Kang, Sang-Baek Koh, Sung-Soo Oh
Ann Occup Environ Med 2018;30:58.   Published online September 5, 2018
DOI: https://doi.org/10.1186/s40557-018-0269-1
AbstractAbstract PDF
Background

It is well known that ergonomic risk factors and back pain are related. However, few studies have examined the relationship between simultaneous exposure to these risk factors and back pain in a Korean population. We aimed to investigate the relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain (LBP) based on the fourth Korean Working Conditions Survey (KWCS).

Method

The fourth KWCS (2014) was used for this study. Chi-square tests and logistic regression were used to assess relationship between 5 ergonomic risk factors and work-related LBP. We also analyzed the relationship between simultaneous exposure to 2 risk factors and work-related LBP.

Results

All 5 ergonomic risk factors (fatigue-inducing and painful posture; lifting or moving people; dragging, pushing, or moving heavy objects; standing posture; and repetitive hand or arm movements) were significantly correlated with work-related LBP in the severe exposure group (adjusted odd ratios [aOR] 5.09, 95% confidence interval [CI] 4.46–5.83; aOR 1.98, 95% CI 1.62–2.42; aOR 2.09, 95% CI 1.82–2.40; aOR 1.79, 95% CI 1.60–2.01; aOR 2.04, 95% CI 1.82–2.30, respectively). When exposed to 2 risk factors simultaneously, the relationship between exposure and work-related LBP was not greater than exposure to only 1 risk factor in our study (usually exposed to ‘fatigue-inducing or painful posture’ aOR 2.17, 95% CI 2.02–2.34; high exposure to both ‘fatigue-inducing or painful posture’ and ‘dragging, pushing, or moving heavy objects’ aOR 2.00, 95% CI 1.82–2.20).

Conclusions

There was a strong relationship between severe exposure to each ergonomic risk factor and work-related LBP. However, when exposed to 2 ergonomic risk factors simultaneously, the relationship between exposure and work-related LBP was not stronger than when exposed to only 1 risk factor in our study.


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Research Article
Factors increasing the risk for psychosocial stress among Korean adults living in rural areas: using generalized estimating equations and mixed models
Ju-Hyun Nam, Myeong-Seob Lim, Hyun-Kyeong Choi, Jae-Yeop Kim, Sung-Kyeong Kim, Sung-Soo Oh, Sang-Baek Koh, Hee-Tae Kang
Ann Occup Environ Med 2017;29:53.   Published online October 31, 2017
DOI: https://doi.org/10.1186/s40557-017-0209-5
AbstractAbstract PDF
Background

This study was conducted to analyze the distribution of the psychosocial well-being index among adults living in two rural communities in Korea and to examine its correlation with lifestyle variables such as sleep duration, regular exercise, and sedentary time.

Methods

Using the cohort data of the Atherosclerosis Risk of a Rural Area Korean General Population, this study examined 3631 participants living in Wonju and Pyeongchang in Gangwon Province; their preliminary data were established from 2005 to 2007 while their follow-up data were collected 3 years later. This study investigated demographic characteristics, lifestyle habits, disease history, Psychosocial Well-being Index-Short Form (PWI-SF) scores, sleep duration, regular exercise, and sedentary time during work. Using repeated measures ANOVA, this study examined how the variables and PWI-SF scores changed over the course of 3 years and identified the correlation between them based on mixed model analysis. Afterwards, using the generalized estimation equation, this study identified each variable’s risk towards the PWI-SF high-risk group and performed a stratified analysis by occupation after dividing the participants into farmers and non-farmers.

Results

The PWI-SF high-risk group was found to be 18.9% of the participants from preliminary data and 15.5% from follow-up data. The odds ratio towards the PWI-SF high-risk group was 1.503 (95% CI 1.241–1.821) in the short sleep duration group and 1.327 (95% CI 1.136–1.550) in the non-regular exercise group. A stratified analysis by occupation showed that middle and long sedentary time in the white-collar group increased the risk toward the PWI-SF high-risk group.

Conclusions

Short sleep duration, no regular exercise, and long sedentary time in the white-collar group were identified as risk factors toward the PWI-SF high-risk group in the rural communities, and policy interventions are needed to address this issue.


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Research Article
Self-resilience as a protective factor against development of post-traumatic stress disorder symptoms in police officers
Jong-Ku Lee, Hyeon-Gyeong Choi, Jae-Yeop Kim, Juhyun Nam, Hee-Tae Kang, Sang-Baek Koh, Sung-Soo Oh
Ann Occup Environ Med 2016;28:58.   Published online October 17, 2016
DOI: https://doi.org/10.1186/s40557-016-0145-9
AbstractAbstract PDF
Background

This study was conducted to check whether self-resilience, one of the characteristics known to affect the occurrence of post-traumatic stress disorder (PTSD) symptoms after experiencing traumatic events, could serve as a protective factor for police officers whose occupational factors are corrected.

Methods

We conducted a cross-sectional study in which 112 male police officers in Gangwon Province participated. They visited the Wonju Severance Christian Hospital Occupational Environment Center for medical check-ups from June to December 2015. Their general characteristics were identified using structured questionnaires, and they were asked to fill in the Korean Occupational Stress Scale-Short Form (KOSS-SF). Further, the Center for Epidemiologic Studies-Depression Scale (CES-D), Connor–Davidson Resilience Scale-Korean (CD-RI-K), and Impact of Event Scale-Revised-Korean version (IES-R-K) were used to evaluate their job stress, depression, self-resilience, and PTSD symptoms. Logistic regression analysis was conducted to correct their personal, occupational, and psychological factors to analyze the relationship between self-resilience and PTSD symptoms.

Results

Among 112 respondents who experienced a traumatic event, those with low self-resilience had significantly higher rate of PTSD symptoms than those with high self-resilience even after correcting for the covariate of general, occupational, and psychological characteristics (odds ratio [OR] 3.51; 95 % CI: 1.06–19.23).

Conclusions

Despite several limitations, these results suggest that a high degree of self-resilience may protect police officers from critical incident-related PTSD symptoms.


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Research Article
Association between night work and cardiovascular diseases: analysis of the 3rd Korean working conditions survey
Sungjin Park, Juhyun Nam, Jong-Ku Lee, Sung-Soo Oh, Hee-Tae Kang, Sang-Baek Koh
Ann Occup Environ Med 2015;27:15.   Published online May 11, 2015
DOI: https://doi.org/10.1186/s40557-015-0064-1
AbstractAbstract PDF
Objectives

This study was conducted to investigate the relationship between night work and cardiovascular diseases among wage workers in Korea.

Methods

The study was based on the 3rd Korean Working Conditions Survey (KWCS; 2011). This study included 29,711 wage workers. We used the chi-squared test and logistic regression to examine the association between cardiovascular diseases and night work and cumulative night work.

Results

Among all of the paid workers, 12.5% reported doing night work ≥ 1 day per month. Night work was significantly associated with an increased risk of cardiovascular diseases (odds ratio [OR] 1.58, 95% confidence interval [CI] 1.11-2.25). Also, compared to the group that did not do night works, the group with higher cumulative night work demonstrated an increased risk for cardiovascular diseases (OR 1.81, 95% CI 1.19-2.74).

Conclusions

This study suggests that night work is significantly associated with cardiovascular diseases.


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Research Article
The Relationship between Injury and Socioeconomic Status in Reference to the Fourth Korean National Health and Nutrition Examination Survey
Sung-Kyung Kim, Hyocher Kim, Kyungsuk Lee, Hee-Tae Kang, Sung-Soo Oh, Sang Baek Ko
Ann Occup Environ Med 2014;26:1.   Published online January 3, 2014
DOI: https://doi.org/10.1186/2052-4374-26-1
AbstractAbstract PDF
Objectives

This study aims to investigate the relationship between the total injury experience rate and socioeconomic status based on the fourth Korea National Health and Nutrition Examination Survey (KNHANES).

Methods

By analyzing data from the fourth KNHANES conducted from 2007 to 2009, we estimated the injury experience rate according to socioeconomic status, including the occupational characteristics of 11,837 subjects. Setting the injury experience rate as a dependent variable and socioeconomic status as an independent variable, we performed logistic regression to calculate odds ratios reflecting the likelihood of injury according to socioeconomic status while controlling for relevant covariates.

Results

In 797 subjects who had injury experience over the past 1 year, 290 persons (36.4%) had a work-related injury. As their income, home value, and educational status increased, their injury experiences decreased. Among occupational groups, the craft, equipment, machine operating, and assembling workers showed the highest rate (10.6%) of injury experience, and the lowest rate (5.7%) was found in the unemployed group. After adjusting for the confounding variables, the experience of injury was significantly related to several socioeconomic factors: high income (OR = 0.54; 95% CI: 0.34-0.86), high home value (OR = 0.65; 95% CI: 0.43-0.96), low education status (OR = 1.28; 95% CI: 1.07-1.52), and specific occupations such as craft, equipment, machine operating, and assembling work (OR = 1.99; 95% CI: 1.60-2.47), skilled agriculture, forestry and fishery work (OR = 1.43; 95% CI: 1.02-2.01), and simple labor (OR = 1.38; 95% CI: 1.04-1.82).

Conclusions

The injury experience rate differed depending on the socioeconomic status. A negative correlation was found between the injury experience rate and income, low home value, and education level. Moreover, a higher rate of injury experience was found in occupation groups and physical worker groups in comparison to the unemployed group and white-collar worker groups. This study would be useful in selecting appropriate priorities for injury management in Korea.


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Research Article
Emotional labor and dysmenorrhea in women working in sales and call centers
In-Jung Cho, Hyunjoo Kim, Sinye Lim, Sung-Soo Oh, Sungjin Park, Hee-Tae Kang
Ann Occup Environ Med 2014;26:45.   Published online November 7, 2014
DOI: https://doi.org/10.1186/s40557-014-0045-9
AbstractAbstract PDF
Objectives

This study was conducted to investigate the association between emotional labor and dysmenorrhea among women working in sales and call centers in Seoul, South Korea.

Methods

Working women in sales jobs and call centers in Seoul were interviewed face-to-face by well-trained interviewers. In total, 975 participants were analyzed in the final model. Emotional labor was measured using a constructed questionnaire with two components: an emotive effort component with three questions and an emotive dissonance component with five questions. To examine the association between emotional labor and dysmenorrhea, chi-squared tests and logistic regression were applied.

Results

The prevalence of dysmenorrhea among sales workers and call center workers were 43.0% and 61.1%, respectively. The adjusted odds ratios (OR) of emotive effort and emotive dissonance for dysmenorrhea in call center workers were 1.88 (95% confidence interval [CI], 1.07–3.28) and 1.72 (95% CI, 1.13–2.63), respectively. The adjusted OR of emotive effort and emotive dissonance for dysmenorrhea in sales workers were 1.71 (95% CI, 0.92–3.16) and 1.15 (95% CI, 0.67–1.98), respectively.

Conclusions

Emotional labor was found to be associated with dysmenorrhea in call center workers. Further studies to investigate other factors, such as management strategies and the relationship between emotional labor and dysmenorrhea, are needed to support interventions to prevent dysmenorrhea that will further promote the quality of health and life of working women.


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