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HOME > Ann Occup Environ Med > Volume 37; 2025 > Article
Original Article Commuting time and musculoskeletal pain in the relationship with working time: a cross-sectional study
Hoje Ryu1,2orcid, Seong-Sik Cho1,2,*orcid, Jung Il Kim1,2,*orcid, Sun-Haeng Choi3orcid, Nathan Kim1orcid
Annals of Occupational and Environmental Medicine 2025;37:e4.
DOI: https://doi.org/10.35371/aoem.2025.37.e4
Published online: February 19, 2025

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*Corresponding author: Seong-Sik Cho Department of Occupational and Environmental Medicine, Dong-A University College of Medicine, 32 Daesingongwon-ro, Seo-gu, Busan 49201, Korea E-mail: sscho@dau.ac.kr
*Jung Il Kim Department of Occupational and Environmental Medicine, Dong-A University College of Medicine, 32 Daesingongwon-ro, Seo-gu, Busan 49201, Korea E-mail: kimji@dau.ac.kr
• Received: September 25, 2024   • Revised: September 25, 2024   • Accepted: September 25, 2024

© 2025 Korean Society of Occupational & Environmental Medicine

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  • Background
    Commuting is essential for working life; however, prolonged travel times can negatively affect health, particularly musculoskeletal pain. This study aims to examine the relationship between commuting time and musculoskeletal pain (back, upper extremity, and lower extremity pain), in the context of working time.
  • Methods
    This cross-sectional study used data from the Sixth Korean Working Conditions Survey conducted in Korea between October 2020 and April 2021. Variables such as commuting time, weekly working hours, and shift work were assessed using the survey questions. Musculoskeletal pain was determined based on self-reported pains in the previous year. The covariates included demographics, employment status, ergonomic risks, and job stress. The association between commuting time and musculoskeletal pain stratified by weekly working hours or shift work was analyzed by survey-weighted logistic regression analysis.
  • Results
    This study found a significant association between longer commuting times and increased prevalence of musculoskeletal pain, particularly back, upper extremity, and lower extremity pain. When commuting time was ≤60, 61–120, >120 minutes, the odds ratio was 1.00, 1.33 (95% confidence interval [CI]: 1.16–1.52), and 2.41 (95% CI: 1.77–3.29) for back pain; 1.00, 1.29 (95% CI: 1.13–1.46), and 2.27 (95% CI: 1.71–3.00) for upper extremity pain; and 1.00, 1.24 (95% CI: 1.05–1.45), and 1.53 (95% CI: 1.13–2.08) for lower extremity pain, respectively. Furthermore, except for upper extremity pain, this trend was amplified when participants were concurrently exposed to long working hours, and for lower extremity pain, this trend was aggravated among shift workers.
  • Conclusions
    Long commuting time may be a risk factor for musculoskeletal pain, and its’ effects could be aggravated when combined with long working hours or shift work. This study observed the detrimental impact of prolonged commuting on musculoskeletal health, particularly among employees with extended working hours or shift work.
  • Keywords: Transportation; Cross-sectional studies; Musculoskeletal pain; Risk factors; Survey
For many individuals, commuting is an integral part of their daily routines, representing a significant portion of their waking hours and exerting a significant impact on their well-being. Prolonged commuting times have been associated with increased stress levels, potentially exacerbating conditions, such as depression and anxiety.1-3 In addition, prolonged periods of standing or sitting while commuting, under cramped or uncomfortable conditions, can contribute to poor posture and musculoskeletal discomfort.4 Moreover, long commuting time often translates to reduced time for familial engagements and personal activities, thereby disrupting work-life balance and overall quality of life.5-7 Such commuting-related stress and discomfort can extend into the work environment and lead to reduced productivity, low job satisfaction, and increased absenteeism.8-10
Concurrently, prolonged working hours pose significant health risks, such as fatigue, obesity, and cardiovascular disease, while also contributing to mental health issues such as stress, depression, and sleep disturbances.11-13 Individuals working long hours often have limited time and opportunities for physical activity, which is crucial for maintaining musculoskeletal health.14 Reduced physical activity can lead to weakened muscles, a lack of flexibility, and increased susceptibility to musculoskeletal disorders.15,16 Moreover, disruption of circadian rhythms induced by shift work can lead to sleep disturbances and increased inflammation, further exacerbating chronic pain.17,18 Such disruptions in circadian rhythms are also associated with impaired alertness and concentration, which can increase the risk of workplace accidents and injuries.19-22
Musculoskeletal pain is a prevalent health issue and a significant public health concern.23 Occupationally related risk factors include prolonged sitting, repetitive movements, awkward postures, and heavy physical workload.24,25 In addition, psychosocial factors such as job strain and dissatisfaction can also contribute to musculoskeletal pain.26,27 The implications of musculoskeletal pain in the working population are significant. In addition to discomfort and reduced quality of life, musculoskeletal pain can lead to absenteeism, reduced productivity, and increased healthcare costs.28-30 For workers, this may result in decreased job satisfaction, impaired job performance, and restricted engagement in physical and recreational activities.31-33
Daily commuting, a common ritual for millions of working individuals, presents a dichotomous scenario. Although it facilitates access to employment and opportunities, prolonged commuting times have raised concerns about the associated potential adverse health effects. Therefore, this study focuses on a particular aspect of health, that is, musculoskeletal pain (including back pain, upper extremity pain, and lower extremity pain), and explores its relationship with daily commuting time in the context of weekly working hours and shift work. We hypothesized that longer commuting times are associated with a higher prevalence of musculoskeletal pain and that this association would be more pronounced in populations with longer weekly working hours or those engaged in shift work. This study aimed to provide valuable insights into the potential health risks associated with extended commuting in the context of working hours and shift work by examining these factors.
Study population
In this secondary cross-sectional study, we obtained data from the Sixth Korean Working Conditions Survey (KWCS) conducted by the Institute of Occupational Safety and Health Research of the Korea Occupational Safety and Health Agency. The survey was conducted between October 2020 and April 2021 in 17 cities and metropolitan areas in Korea, targeting economically active individuals aged ≥15 years. The KWCS benchmarks the European Working Conditions Survey (EWCS), ensuring comparability between their items. The contents of the survey included sociodemographic factors, general working conditions such as various occupational exposures, and the health status of the participants, including self-rated health and sleep disturbances. The survey weight of the present study was determined based on sample design, non-response rates, and post-stratification weights.
The total sample size for the sixth KWCS was 50,538. This study included only paid employees; therefore, non-paid family workers (n=1,749), self-employed with employees (n=2,444), and self-employed without employees (n=7,827) were excluded. In addition, we excluded individuals who worked fewer than 35 hours per week (n=6,074), to include only those with sufficient working hours. For each survey item, there were respondents who answered “don’t know/no opinion” or “refused.” Therefore, they were excluded from the analysis. Finally, the population size for the analysis was 28,496 for back pain, 28,490 for upper extremity pain, and 28,487 for lower extremity pain in the fully adjusted model (Model 2).
Commuting time, weekly working hours, and shift work
Estimates of commuting time were calculated from responses to the question “In total, how many min per day do you usually spend traveling from home to work and back?” Subsequently, the participants were classified into three groups: ≤60 minutes, 61–120 minutes, and >120 minutes. The question “How many hours do you actually work at your workplace in a week or a month?” was used to calculate weekly working hours by adding responses for the main and other (side) jobs. Working hours were categorized into three groups: 35–40 hours, 41–52 hours, and >52 hours per week. Shift work was evaluated using the question “Do you work shifts?” The respondents who replied “yes” were assigned to shift workers, whereas those who replied “no” were assigned to non-shift workers.
Musculoskeletal pain
Musculoskeletal pain was assessed using the question, “Over the last 12 months, did you have any of the following health problems?” The items of health problems were presented as “Backache” for back pain, “Muscular pains in shoulders, neck and/or upper limbs (arms, elbows, wrists, hands, etc.)” for upper extremity pain, and “Muscular pains in lower limbs (hips, legs, knees, feet, etc.)” for lower extremity pain. Those who responded “yes” were considered to have musculoskeletal pain, whereas those who responded “no” were considered to have no musculoskeletal pain.
Ergonomic risk exposures
Ergonomic factors were evaluated using the question, “Please tell me, using the same scale, does your main paid job involve?” “Tiring or painful positions (except standing or sitting)” was for awkward postures, “carrying or moving heavy loads” was for heavy physical workload, “standing” was for prolonged standing, and “repetitive hand or arm movements” was for repetitive movements. Responses of “all of the time,” “almost all of the time,” “around 3/4 of the time,” “around half of the time,” or “around 1/4 of the time” were regarded as exposed to ergonomic factors, whereas “almost never” or “never” were regarded as not exposed to ergonomic factors.
Other covariates
We included the following variables as covariates in our study: sex, age, education level, monthly income, employment status, occupation, ergonomic factors (awkward postures, heavy physical workload, prolonged standing, repetitive movements), and job stress (low job control, effort-reward imbalance, and organizational injustice). Age was categorized into five groups: 15–29, 30–39, 40–49, 50–59, and ≥60 years. Education level was classified into three groups: middle school or lower, high school, and college or higher. Income was divided into four quartiles according to the participants' net monthly earnings: lowest, low-middle, high-middle, and highest. Employment status was categorized as regular, temporary, or daily. “Low job control was assessed using the question,” “Can you influence decisions that are important for your work?” Responses of “rarely” or “never” were considered as “yes,” whereas responses of “always” or “most of the time” or “sometimes” were considered as “no.” Effort-reward imbalance was estimated by the question, “Considering all your efforts and achievements in your job, do you feel that you get paid appropriately?” Responses of “tend to disagree” or “strongly disagree” were regarded as “effort-reward imbalance,” whereas responses of “strongly agree,” “tend to agree,” or “neither agree nor disagree” were considered as “no effort–reward imbalance.” Organizational injustice was evaluated using the question, “Are you treated fairly at your workplace?” Responses of “rarely” or “never” were treated as “yes,” whereas responses of “always” or “most of the time” or “sometimes” were considered as “no.”
Statistical analysis
The distributions of the sociodemographic and occupational variables in the population are presented as numbers and percentages according to commuting time. The prevalence of back pain, upper extremity pain, and lower extremity pain according to commuting time was calculated. Participants were stratified according to weekly working hours and shift work, and the prevalence of back, upper extremity, and lower extremity pain was assessed by commuting time in the stratum of weekly working hours and shift work. The association between commuting time and back, upper extremity, and lower extremity pain stratified by working hours and shift work was analyzed using multiple logistic regression analysis. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated to assess associations. Age, sex, education, income, occupation, and employment status were adjusted for in Model 1, and working hours, shift work, awkward postures, heavy physical workload, prolonged standing, repetitive movements, effort-reward imbalance, low job control, organizational injustice were additionally adjusted for in Model 2. All statistical analyses were performed using Stata version 18.0 (Stata Corp., College Station, TX, USA).
Data sharing
The datasets generated and/or analyzed during the current study are available in the Occupational Safety and Health Research Institute (OSHRI) repository, https://www.kosha.or.kr/oshri/researchField/downWorkingEnvironmentSurvey.do.
Ethics statement
This study used publicly available data from the KWCS and was approved by the Institutional Review Board of Dong-A (approval no. 2-1040709-AB-N-01-202402-HR-008-02).
Table 1 presents the distribution of the study population characteristics according to the daily commute time. The proportion of men (61.2%) was higher than that of women (38.8%). Regarding age, the largest proportion was observed in the 40–49 years age group (26.5%), whereas the smallest proportion was observed in the ≥60 years age group (9.6%). The group with college or higher education accounted for the largest proportion (64.7%). In terms of employment status, most of the workers belonged to the regular employment group (89.2%). The proportion of the occupational group was largest in the manual group (33.1%) and smallest in the sales and service group (14.6%). In terms of long commutes (>2 hours), the proportion was higher in men (3.6%) than in women (2.5%). Regarding age, the largest proportion was observed in the 40–49 years age group (3.7%), and the smallest in the ≥60 years age group (2.0%). Regarding education, long commuters accounted for the largest proportion among those with college or higher education (3.9%) and the smallest proportion in the high school group (1.9%). As the income group increased, commuting time increased. Regarding employment status, the proportion of long commutes was higher in the regular (3.3%) and daily (3.3%) groups than in the temporary group (2.2%). Participants in professional and managerial occupations accounted for the largest proportion of long commutes (5.4%), whereas those in sales and service occupations accounted for the smallest proportion (1.4%). The shorter the weekly working hours, the greater the proportion of long commuting times. Additionally, the proportion of long commuting times was greater among non-shift workers (3.4%) than among shift workers (1.5%).
Table 2 shows the prevalence of back, upper extremity, and lower extremity pain according to commuting time, stratified by weekly working hours or shift work. In terms of daily commuting time, the prevalence of back and upper extremity pain increased as commuting time increased, whereas lower extremity pain showed no significant difference. When stratified by weekly working hours, the prevalence of back and upper extremity pain was the highest when weekly working hours exceeded 52 hours and commuting time exceeded 2 hours: 46.4% for back pain and 46.6% for upper extremity pain. The prevalence of lower extremity pain was highest when weekly working hours exceeded 52 hours and commuting time was 61–120 minutes (26.0%). When stratified by shift work, the prevalence of all types of musculoskeletal pain was highest among individuals who engaged in shift work with commuting times exceeding 2 hours: 43.2% for back pain, 40.7% for upper extremity pain, and 40.3% for lower extremity pain.
Table 3 and Fig. 1 demonstrate the association between daily commuting time and back pain, upper extremity pain, and lower extremity pain, stratified by weekly working hours or shift work. For all types of musculoskeletal pain, the likelihood of experiencing those symptoms increased as commuting time increased; the OR was 1.00, 1.33 (95% CI: 1.16–1.52), and 2.41 (95% CI: 1.77–3.29) for back pain; 1.00, 1.29 (95% CI: 1.13–1.46), and 2.27 (95% CI: 1.71–3.00) for upper extremity pain; and 1.00, 1.24 (95% CI: 1.05–1.45), and 1.53 (95% CI: 1.13–2.08) for lower extremity pain. In addition, when stratified by weekly working hours, the OR tended to increase as commuting time increased in all strata, except for upper extremity pain. On the shift work table, for lower extremity pain, the OR was highest when exposed to shift work and long commuting time (>2 hours) simultaneously. However, for back pain and upper extremity pain, the OR was highest in the stratum with no shift work and commuting time exceeding 2 hours. Although the OR was high for simultaneous exposure to long commuting times and long working hours or shift work, the results need to be interpreted with caution because the sample sizes for some strata were too small, and the CIs were therefore wide.
The supplementary tables show stratified analysis for the control of ergonomic risks. Supplementary Tables 1 and 2 present the prevalence of back pain according to awkward postures and heavy physical workload by daily commuting time stratified by weekly working hours or shift work. Supplementary Tables 3–5 demonstrate the prevalence of upper extremity pain according to awkward postures, heavy physical workload, and repetitive movements by daily commuting time stratified by weekly working hours or shift work. Supplementary Tables 6 and 7 show the prevalence of lower extremity pain according to awkward postures and prolonged standing by daily commuting time stratified by weekly working hours or shift work.
This study examined the relationship between commuting time and musculoskeletal pain (back, upper extremity, and lower extremity pain), with particular emphasis on co-exposure to long working hours and shift work. A consistent trend of increased OR was seen for all types of musculoskeletal pain as commuting time increased. Even when ergonomic factors were adjusted in the analysis, the trend did not change. The OR for back and lower extremity pain was the highest when commuting time exceeded 2 hours and weekly work hours exceeded 40 hours. In addition, when stratified by shift work, the OR for lower extremity pain was highest when simultaneously exposed to shift work and long commuting time (>2 hours).
Several mechanisms may explain these findings. Maintaining a static posture during commuting can cause musculoskeletal pain, and this physical burden can further increase with longer commuting times.34 Long commuting times indicate less time for sleep and recovery. Workers with long commutes have fewer opportunities for muscle and joint healing, which may increase the prevalence of musculoskeletal pain.35 In addition, psychosocial stressors associated with extended commuting, such as traffic congestion and time pressure, can contribute to the development or exacerbation of musculoskeletal pain.36
Prolonged static posture or overuse of muscles and joints owing to long working hours can contribute to an increased risk of musculoskeletal injury.37 Similar to long commute times, long working hours deprive workers of the time to rest and sleep, hindering injury recovery.38 Shift work can exacerbate inflammation by increasing the C-reactive protein levels, which may increase the risk of musculoskeletal pain.18 Moreover, shift work-induced circadian rhythm disruption may exacerbate sleep disturbances, further impeding recovery and increasing susceptibility to musculoskeletal pain.39,40 Consequently, owing to these pathways, co-exposure to long commuting times, long working hours, or shift work can amplify the detrimental effects of long commuting times on musculoskeletal pain.
Our results are consistent with those of previous studies. A previous study investigated the association between daily commutes and subjective health complaints among 628 full-time bank employees in Dhaka.41 In a previous study, musculoskeletal pain was investigated using seven items: headache, migraine, neck pain, lower back pain, upper back pain, arm pain, shoulder pain, and leg pain. The OR for musculoskeletal pain significantly increased when the average commute time exceeded 30 minutes. However, the participants in this previous study comprised only office workers, and the impact of simultaneous exposure to weekly working hours or shift work was not considered. Another study investigated the relationship between commuting time and work-related lows by using data from the sixth KWCS.42 The results of this previous study showed that the OR significantly increased when the commuting time was more than 40 minutes, and if a worker was participating in sports and leisure activities, the OR increased significantly when the commuting time was more than 60 minutes. However, this previous study only evaluated work-related lower back pain among patients with musculoskeletal pain and did not consider the effects of weekly working hours or shift work.
In our study, we used data from a sample representing the working population of South Korea, enabling a stratified analysis with sufficient statistical power. However, our study has several limitations. First, as all assessments of commuting time, working hours, shift work, and musculoskeletal pain were based on the participants’ subjective responses, a potential information bias may be introduced. Second, the mode of commuting may also affect workers’ health, but information about the modes of commuting was not assessed; thus, the influence of the commuting mode was not analyzed. However, regardless of commuting mode, long commuting time may be an ergonomic burden, such as long standing and sitting, or awkward postures owing to cramped space. Third, other risk factors of musculoskeletal disorders according to occupational characteristics and types of shift work were not considered. These factors may provide an additional explanation for why the OR for upper extremity pain was highest in workers who work less than 40 hours per week and commuting time exceeded 2 hours, and the OR for back pain and upper extremity pain was highest among non-shift workers. Finally, as this was a cross-sectional study, the relationships between exposure prior to health outcomes could not be established.
Long commuting time may be a risk factor for musculoskeletal pain, which could be further exacerbated by long working hours and shift work. These findings suggest that commuting time should be considered an important factor in health management, especially for those who work long hours or shifts. In future research, longitudinal studies using objective measures are needed.

CI

confidence interval

EWCS

European Working Conditions Survey

KWCS

Korean Working Conditions Survey

OR

odds ratio

OSHRI

Occupational Safety and Health Research Institute

Funding

This study is supported by Dong-A University research fund.

Competing interests

The authors declare that they have no competing interests.

Author contributions

Conceptualization: Ryu H, Cho SS, Kim JI. Formal analysis: Ryu H, Cho SS. Funding acquisition: Cho SS. Methodology: Ryu H, Cho SS. Writing - original draft: Ryu H. Cho SS. Writing - review & editing: Cho SS, Kim JI, Choi SH, Kim N.

Acknowledgments

The authors would like to thank the Occupational Safety and Health Research Institute (OSHRI) and the Korea Occupational Safety and Health Agency (KOSHA) for providing us with raw data from the Sixth Korean Working Conditions Survey (KWCS).

Supplementary Table 1.
Prevalence of back pain according to daily commuting time with/without awkward postures (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-1.pdf
Supplementary Table 2.
Prevalence of back pain according to daily commuting time with/without heavy physical workload (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-2.pdf
Supplementary Table 3.
Prevalence of upper extremity pain according to daily commuting time with/without awkward postures (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-3.pdf
Supplementary Table 4.
Prevalence of upper extremity pain according to daily commuting time with/without heavy physical workload (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-4.pdf
Supplementary Table 5.
Prevalence of upper extremity pain according to daily commuting time with/without repetitive movements (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-5.pdf
Supplementary Table 6.
Prevalence of lower extremity pain according to daily commuting time with/without awkward postures (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-6.pdf
Supplementary Table 7.
Prevalence of lower extremity pain according to daily commuting time with/without prolonged standing (including stratified analysis by weekly working hours and shift work)
aoem-2025-37-e4_Supplementary-Table-7.pdf
Fig. 1.
Association between daily commuting time and musculoskeletal pain stratified by weekly working hours or shift work. (A) Association between daily commuting time and back pain according to weekly working hours. (B) Association between daily commuting time and back pain according to shift work. (C) Association between daily commuting time and upper extremity pain according to weekly working hours. (D) Association between daily commuting time and upper extremity pain according to shift work. (E) Association between daily commuting time and lower extremity pain according to weekly working hours. (F) Association between daily commuting time and lower extremity pain according to shift work.
aoem-2025-37-e4f1.jpg
Table 1.
Characteristics of the study participants according to daily commuting time
Characteristic Total Daily commuting time (minutes)
≤60 61–120 >120 p-value
Sex <0.001
 Male 18,649 (61.2) 14,462 (77.5) 3,507 (18.8) 681 (3.6)
 Female 11,809 (38.8) 9,898 (83.8) 1,621 (13.7) 290 (2.5)
Age group (years) 0.001
 15–29 4,928 (16.2) 3,951 (80.2) 807 (16.4) 170 (3.4)
 30–39 7,624 (25.0) 5,931 (77.8) 1,455 (19.1) 238 (3.1)
 40–49 8,074 (26.5) 6,388 (79.1) 1,386 (17.2) 300 (3.7)
 50–59 6,906 (22.7) 5,634 (81.6) 1,069 (15.5) 203 (2.9)
 ≥60 2,926 (9.6) 2,456 (83.9) 411 (14.0) 59 (2.0)
Education <0.001
 Middle school or less 1,348 (4.4) 1,130 (83.8) 189 (14.0) 29 (2.1)
 High school 9,400 (30.9) 8,097 (86.1) 1,125 (12.0) 178 (1.9)
 College or higher 19,661 (64.7) 15,100 (76.8) 3,801 (19.3) 760 (3.9)
Income <0.001
 Lowest 2,324 (8.0) 2,054 (88.4) 228 (9.8) 42 (1.8)
 Low middle 11,358 (39.2) 9,466 (83.3) 1,625 (14.3) 267 (2.4)
 High middle 8,482 (29.3) 6,762 (79.7) 1,469 (17.3) 251 (3.0)
 Highest 6,826 (23.5) 4,896 (71.7) 1,580 (23.2) 350 (5.1)
Employment status 0.020
 Regular 27,181 (89.2) 21,661 (79.7) 4,632 (17.0) 888 (3.3)
 Temporary 2,355 (7.7) 1,977 (83.9) 326 (13.8) 52 (2.2)
 Daily 922 (3.0) 722 (78.3) 170 (18.4) 30 (3.3)
Occupation <0.001
 Professional and managerial 8,237 (27.0) 6,103 (74.1) 1,689 (20.5) 445 (5.4)
 Clerical (office work) 7,700 (25.3) 5,872 (76.3) 1,536 (19.9) 292 (3.8)
 Sales and service 4,450 (14.6) 3,892 (87.4) 498 (11.2) 60 (1.4)
 Manual 10,072 (33.1) 8,493 (84.3) 1,405 (13.9) 174 (1.7)
Weekly working hours <0.001
 1–34 0 (0) 0 (0) 0 (0) 0 (0)
 35–40 20,235 (66.4) 15,922 (78.7) 3,579 (17.7) 734 (3.6)
 41–52 7,887 (25.9) 6,458 (81.9) 1,227 (15.6) 202 (2.6)
 53–60 1,798 (5.9) 1,522 (84.6) 247 (13.7) 29 (1.6)
 >60 539 (1.8) 458 (85.0) 76 (14.0) 5 (1.0)
Shift work <0.001
 No 27,195 (89.5) 21,584 (79.4) 4,692 (17.3) 919 (3.4)
 Yes 3,174 (10.5) 2,711 (85.4) 414 (13.1) 49 (1.5)
Awkward postures <0.001
 No 20,143 (66.2) 15,698 (77.9) 3,666 (18.2) 779 (3.9)
 Yes 10,288 (33.8) 8,648 (84.1) 1,448 (14.1) 192 (1.9)
Heavy physical workload 0.002
 No 21,890 (72.0) 17,345 (79.2) 3,769 (17.2) 776 (3.5)
 Yes 8,520 (28.0) 6,983 (82.0) 1,344 (15.8) 193 (2.3)
Prolonged standing <0.001
 No 12,367 (40.7) 9,132 (73.8) 2,603 (21.1) 632 (5.1)
 Yes 18,052 (59.3) 15,209 (84.2) 2,505 (13.9) 338 (1.9)
Repetitive movements <0.001
 No 12,234 (40.2) 9,419 (77.0) 2,334 (19.1) 481 (3.9)
 Yes 18,171 (59.8) 14,900 (82.0) 2,784 (15.3) 487 (2.7)
Low job control <0.001
 No 23,982 (78.9) 19,071 (79.5) 4,066 (17.0) 845 (3.5)
 Yes 6,395 (21.1) 5,224 (81.7) 1,049 (16.4) 122 (1.9)
Effort-reward imbalance 0.626
 No 26,784 (88.6) 21,415 (80.0) 4,532 (16.9) 837 (3.1)
 Yes 3,446 (11.4) 2,759 (80.1) 561 (16.3) 126 (3.6)
Organizational injustice 0.873
 No 27,664 (91.2) 22,110 (79.9) 4,679 (16.9) 875 (3.2)
 Yes 2,657 (8.8) 2,127 (80.1) 437 (16.4) 93 (3.5)

Values are presented as number (%).

Table 2.
The prevalence of back pain, upper extremity pain, and lower extremity pain by daily commuting time, weekly working hours, and shift work (including stratified analysis by weekly working hours and shift work)
Back pain
 Upper extremity pain
 Lower extremity pain
Total (–) (+) p-value Total (–) (+) p-value Total (–) (+) p-value
Daily commuting time (minutes)
 ≤60 24,335 (80.0) 18,724 (76.9) 5,611 (23.1) <0.001 24,327 (80.0) 17,550 (72.1) 6,777 (27.9) 0.002 24,328 (80.0) 21,016 (86.4) 3,312 (13.6) 0.966
 61–120 5,123 (16.8) 3,793 (74.0) 1,330 (26.0) 5,121 (16.8) 3,622 (70.7) 1,500 (29.3) 5,124 (16.8) 4,416 (86.2) 708 (13.8)
 >120 970 (3.2) 637 (65.7) 333 (34.3) 968 (3.2) 613 (63.3) 355 (36.7) 970 (3.2) 838 (86.4) 132 (13.6)
Weekly working hours
 35–40 20,485 (66.4) 16,143 (78.8) 4,342 (21.2) <0.001 20,473 (66.3) 15,151 (74.0) 5,322 (26.0) <0.001 20,475 (66.3) 18,086 (88.3) 2,389 (11.7) <0.001
 41–52 7,988 (25.9) 5,710 (71.5) 2,278 (28.5) 7,985 (25.9) 5,473 (68.5) 2,512 (31.5) 7,989 (25.9) 6,703 (83.9) 1,286 (16.1)
 >52 2,400 (7.8) 1,591 (66.3) 809 (33.7) 2,399 (7.8) 1,440 (60.0) 959 (40.0) 2,398 (7.8) 1,873 (78.1) 525 (21.9)
Shift work
 (–) 27,568 (89.6) 21,096 (76.5) 6,472 (23.5) <0.001 27,557 (89.6) 19,835 (72.0) 7,722 (28.0) <0.001 27,561 (89.6) 23,996 (87.1) 3,565 (12.9) <0.001
 (+) 3,213 (10.4) 2,279 (70.9) 934 (29.1) 3,212 (10.4) 2,164 (67.4) 1,048 (32.6) 3,210 (10.4) 2,586 (80.6) 624 (19.4)
Weekly working hours
 35–40 hours
  Commuting time (minutes)
   ≤60 15,907 (78.7) 12,675 (79.7) 3,232 (20.3) <0.001 15,900 (78.7) 11,866 (74.6) 4,034 (25.4) <0.001 15,898 (78.7) 14,044 (88.3) 1,854 (11.7) 0.774
   61–120 3,574 (17.7) 2,783 (77.9) 791 (22.1) 3,572 (17.7) 2,641 (73.9) 931 (26.1) 3,575 (17.7) 3,163 (88.5) 412 (11.5)
   >120 734 (3.6) 494 (67.3) 240 (32.7) 733 (3.6) 462 (63.0) 271 (37.0) 733 (3.6) 638 (87.1) 95 (12.9)
 41–52 hours
  Commuting time (minutes)
   ≤60 6,449 (81.9) 4,705 (73.0) 1,744 (27.0) 0.003 6,448 (81.9) 4,467 (69.3) 1,981 (30.7) 0.160 6,452 (81.9) 5,414 (83.9) 1,038 (16.1) 0.662
   61–120 1,226 (15.6) 809 (66.0) 417 (34.0) 1,227 (15.6) 794 (64.7) 433 (35.3) 1,227 (15.6) 1,015 (82.7) 212 (17.3)
   >120 202 (2.6) 125 (61.8) 77 (38.2) 202 (2.6) 133 (65.9) 69 (34.1) 202 (2.6) 174 (86.3) 28 (13.8)
 >52 hours
  Commuting time (minutes)
   ≤60 1,979 (84.7) 1,344 (67.9) 635 (32.1) 0.200 1,980 (84.7) 1,218 (61.5) 762 (38.5) 0.569 1,979 (84.7) 1,558 (78.7) 421 (21.3) 0.358
   61–120 323 (13.8) 201 (62.4) 122 (37.6) 323 (13.8) 187 (58.0) 136 (42.0) 323 (13.8) 239 (74.0) 84 (26.0)
   >120 35 (1.5) 19 (53.6) 16 (46.4) 34 (1.5) 18 (53.4) 16 (46.6) 35 (1.5) 26 (74.1) 9 (25.9)
Shift work
 Commuting time (minutes)
  (–)
   ≤60 21,562 (85.4) 16,713 (77.5) 4,849 (22.5) <0.001 21,556 (79.4) 15,644 (72.6) 5,912 (27.4) 0.003 21,556 (79.4) 18,752 (87.0) 2,804 (13.0) 0.880
   61–120 4,687 (13.1) 3,503 (74.7) 1,184 (25.3) 4,685 (17.3) 3,349 (71.5) 1,336 (28.5) 4,688 (17.3) 4,086 (87.2) 602 (12.8)
   >120 918 (1.5) 608 (66.2) 310 (33.8) 917 (3.4) 583 (63.6) 334 (36.4) 918 (3.4) 806 (87.8) 112 (12.2)
  (+)
   ≤60 2,710 (85.4) 1,959 (72.3) 751 (27.7) 0.179 2,709 (85.4) 1,854 (68.4) 855 (31.6) 0.358 2,708 (85.4) 2,205 (81.4) 503 (18.6) 0.055
   61–120 414 (13.0) 277 (66.8) 137 (33.2) 415 (13.1) 263 (63.4) 152 (36.6) 414 (13.1) 314 (75.9) 100 (24.1)
   >120 49 (1.5) 28 (56.8) 21 (43.2) 49 (1.5) 29 (59.3) 20 (40.7) 49 (1.5) 29 (59.7) 20 (40.3)

Values are presented as number (%).

Table 3.
Musculoskeletal pains and their association with daily commuting time, weekly working hours, and shift work by logistic regression analysis (including stratified analysis by weekly working hours and shift work)
Odds ratio (95% confidence interval)
Back pain
 Upper extremity pain
 Lower extremity pain
Unadjusted Model 1a Model 2b Unadjusted Model 1a Model 2b Unadjusted Model 1a Model 2b
Daily commuting time (minutes)
 ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 61–120 1.17 (1.04–1.32) 1.33 (1.17–1.51) 1.33 (1.16–1.52) 1.07 (0.96–1.20) 1.29 (1.14–1.46) 1.29 (1.13–1.46) 1.02 (0.88–1.18) 1.23 (1.05–1.44) 1.24 (1.05–1.45)
 >120 1.74 (1.34–2.26) 2.24 (1.67–3.00) 2.41 (1.77–3.29) 1.50 (1.17–1.92) 2.07 (1.57–2.72) 2.27 (1.71–3.00) 1.00 (0.76–1.31) 1.30 (0.98–1.73) 1.53 (1.13–2.08)
Weekly working hours
 35–40 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 41–52 1.48 (1.35–1.63) 1.41 (1.27–1.56) 1.36 (1.23–1.52) 1.31 (1.19–1.43) 1.23 (1.12–1.36) 1.19 (1.08–1.32) 1.45 (1.29–1.63) 1.32 (1.17–1.49) 1.26 (1.11–1.43)
 >52 1.89 (1.64–2.17) 1.50 (1.29–1.76) 1.44 (1.24–1.69) 1.90 (1.66–2.17) 1.58 (1.37–1.82) 1.54 (1.33–1.78) 2.12 (1.81–2.49) 1.69 (1.41–2.02) 1.65 (1.38–1.97)
Shift work
 (–) 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 (+) 1.34 (1.17–1.52) 1.18 (1.02–1.36) 1.2 (1.04–1.39) 1.24 (1.10–1.41) 1.06 (0.92–1.22) 1.09 (0.95–1.25) 1.62 (1.39–1.90) 1.36 (1.14–1.63) 1.39 (1.17–1.66)
Weekly working hours
 35–40 hours
  Commuting time (minutes)
   ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
   61–120 1.12 (0.96–1.29) 1.3 (1.11–1.52) 1.32 (1.13–1.55) 1.04 (0.91–1.19) 1.27 (1.10–1.47) 1.29 (1.11–1.51) 0.99 (0.82–1.18) 1.23 (1.01–1.49) 1.27 (1.04–1.54)
   >120 1.90 (1.37–2.64) 2.43 (1.68–3.49) 2.55 (1.75–3.71) 1.72 (1.28–2.32) 2.36 (1.70–3.27) 2.52 (1.82–3.48) 1.13 (0.81–1.57) 1.42 (1.00–2.01) 1.63 (1.12–2.36)
 41–52 hours
  Commuting time (minutes)
   ≤60 1.45 (1.31–1.61) 1.44 (1.29–1.60) 1.37 (1.22–1.53) 1.30 (1.18–1.44) 1.25 (1.13–1.39) 1.20 (1.08–1.34) 1.45 (1.28–1.64) 1.37 (1.20–1.56) 1.29 (1.12–1.47)
   61–120 2.02 (1.61–2.54) 2.07 (1.61–2.67) 1.87 (1.43–2.45) 1.60 (1.28–2.01) 1.75 (1.37–2.23) 1.60 (1.23–2.09) 1.58 (1.17–2.14) 1.69 (1.22–2.33) 1.50 (1.08–2.09)
   >120 2.43 (1.54–3.82) 2.85 (1.73–4.69) 2.83 (1.70–4.70) 1.52 (0.97–2.39) 1.89 (1.14–3.12) 2.04 (1.19–3.50) 1.21 (0.71–2.05) 1.50 (0.86–2.61) 1.73 (1.01–2.97)
 > 52 hours
  Commuting time (minutes)
   ≤60 1.85 (1.59–2.16) 1.65 (1.41–1.94) 1.46 (1.24–1.73) 1.84 (1.60–2.12) 1.68 (1.45–1.96) 1.60 (1.37–1.86) 2.05 (1.71–2.44) 1.81 (1.49–2.19) 1.66 (1.37–2.01)
   61–120 2.37 (1.67–3.36) 2.21 (1.51–3.24) 1.85 (1.25–2.73) 2.13 (1.52–3.00) 1.99 (1.38–2.86) 1.73 (1.20–2.51) 2.67 (1.82–3.91) 2.40 (1.58–3.66) 2.08 (1.35–3.21)
   >120 3.39 (1.38–8.32) 3.25 (1.14–9.26) 2.79 (0.88–8.87) 2.56 (1.05–6.27) 2.54 (0.92–7.01) 2.17 (0.75–6.26) 2.65 (1.01–6.96) 2.51 (0.88–7.18) 2.08 (0.67–6.46)
Shift work
 (–)
  Commuting time (minutes)
   ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
   61–120 1.16 (1.03–1.32) 1.32 (1.16–1.50) 1.31 (1.15–1.51) 1.06 (0.94–1.19) 1.28 (1.12–1.45) 1.28 (1.12–1.46) 0.99 (0.85–1.14) 1.19 (1.02–1.40) 1.19 (1.01–1.40)
   >120 1.76 (1.34–2.31) 2.25 (1.65–3.07) 2.45 (1.77–3.38) 1.52 (1.17–1.96) 2.10 (1.58–2.80) 2.34 (1.75–3.12) 0.93 (0.69–1.24) 1.21 (0.89–1.65) 1.43 (1.03–1.98)
 (+)
  Commuting time (minutes)
   ≤60 1.32 (1.16–1.51) 1.22 (1.06–1.40) 1.18 (1.02–1.37) 1.22 (1.07–1.39) 1.09 (0.95–1.25) 1.09 (0.94–1.25) 1.53 (1.30–1.79) 1.35 (1.14–1.61) 1.32 (1.10–1.57)
   61–120 1.71 (1.11–2.63) 1.78 (1.08–2.93) 1.78 (1.09–2.92) 1.53 (1.02–2.30) 1.53 (0.95–2.46) 1.49 (0.92–2.41) 2.12 (1.27–3.56) 2.08 (1.14–3.78) 2.10 (1.15–3.82)
   >120 2.62 (1.20–5.71) 2.54 (1.09–5.88) 2.10 (0.87–5.10) 1.81 (0.83–3.94) 1.69 (0.74–3.83) 1.35 (0.56–3.25) 4.52 (2.10–9.74) 4.38 (1.77–10.85) 3.85 (1.47–10.08)

aModel 1: Adjusted for sex, age, education, income, occupation, employment status, commuting time (not adjusted in the commuting time table), working hours (not adjusted in the weekly working hours table), shift work (not adjusted in the shift work table), low job control, effort-reward imbalance, and organizational injustice.

bbModel 2: Adjusted for sex, age, education, income, occupation, employment status, commuting time (not adjusted in the commuting time table), working hours (not adjusted in the weekly working hours table), shift work (not adjusted in the shift work table), low job control, effort-reward imbalance, organizational injustice, awkward postures, heavy physical workload, prolonged standing, and repetitive movements.

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    • Association between shift work and brain age gap: a neuroimaging study using MRI-based brain age prediction algorithms
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      Frontiers in Aging Neuroscience.2025;[Epub]     CrossRef
    • Bidirectional genetic associations between chronotype and shift work: A Mendelian randomization study
      Youjin Kim, Jongin Lee, Jeehee Min, Min Young Park, Seung-Yeon Lee, Seunghyun Lee, Wanhyung Lee
      Chronobiology International.2025; 42(12): 1736.     CrossRef

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      Commuting time and musculoskeletal pain in the relationship with working time: a cross-sectional study
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    Commuting time and musculoskeletal pain in the relationship with working time: a cross-sectional study
    Image
    Fig. 1. Association between daily commuting time and musculoskeletal pain stratified by weekly working hours or shift work. (A) Association between daily commuting time and back pain according to weekly working hours. (B) Association between daily commuting time and back pain according to shift work. (C) Association between daily commuting time and upper extremity pain according to weekly working hours. (D) Association between daily commuting time and upper extremity pain according to shift work. (E) Association between daily commuting time and lower extremity pain according to weekly working hours. (F) Association between daily commuting time and lower extremity pain according to shift work.

    Fig. 1.

    Commuting time and musculoskeletal pain in the relationship with working time: a cross-sectional study
    Characteristic Total Daily commuting time (minutes)
    ≤60 61–120 >120 p-value
    Sex <0.001
     Male 18,649 (61.2) 14,462 (77.5) 3,507 (18.8) 681 (3.6)
     Female 11,809 (38.8) 9,898 (83.8) 1,621 (13.7) 290 (2.5)
    Age group (years) 0.001
     15–29 4,928 (16.2) 3,951 (80.2) 807 (16.4) 170 (3.4)
     30–39 7,624 (25.0) 5,931 (77.8) 1,455 (19.1) 238 (3.1)
     40–49 8,074 (26.5) 6,388 (79.1) 1,386 (17.2) 300 (3.7)
     50–59 6,906 (22.7) 5,634 (81.6) 1,069 (15.5) 203 (2.9)
     ≥60 2,926 (9.6) 2,456 (83.9) 411 (14.0) 59 (2.0)
    Education <0.001
     Middle school or less 1,348 (4.4) 1,130 (83.8) 189 (14.0) 29 (2.1)
     High school 9,400 (30.9) 8,097 (86.1) 1,125 (12.0) 178 (1.9)
     College or higher 19,661 (64.7) 15,100 (76.8) 3,801 (19.3) 760 (3.9)
    Income <0.001
     Lowest 2,324 (8.0) 2,054 (88.4) 228 (9.8) 42 (1.8)
     Low middle 11,358 (39.2) 9,466 (83.3) 1,625 (14.3) 267 (2.4)
     High middle 8,482 (29.3) 6,762 (79.7) 1,469 (17.3) 251 (3.0)
     Highest 6,826 (23.5) 4,896 (71.7) 1,580 (23.2) 350 (5.1)
    Employment status 0.020
     Regular 27,181 (89.2) 21,661 (79.7) 4,632 (17.0) 888 (3.3)
     Temporary 2,355 (7.7) 1,977 (83.9) 326 (13.8) 52 (2.2)
     Daily 922 (3.0) 722 (78.3) 170 (18.4) 30 (3.3)
    Occupation <0.001
     Professional and managerial 8,237 (27.0) 6,103 (74.1) 1,689 (20.5) 445 (5.4)
     Clerical (office work) 7,700 (25.3) 5,872 (76.3) 1,536 (19.9) 292 (3.8)
     Sales and service 4,450 (14.6) 3,892 (87.4) 498 (11.2) 60 (1.4)
     Manual 10,072 (33.1) 8,493 (84.3) 1,405 (13.9) 174 (1.7)
    Weekly working hours <0.001
     1–34 0 (0) 0 (0) 0 (0) 0 (0)
     35–40 20,235 (66.4) 15,922 (78.7) 3,579 (17.7) 734 (3.6)
     41–52 7,887 (25.9) 6,458 (81.9) 1,227 (15.6) 202 (2.6)
     53–60 1,798 (5.9) 1,522 (84.6) 247 (13.7) 29 (1.6)
     >60 539 (1.8) 458 (85.0) 76 (14.0) 5 (1.0)
    Shift work <0.001
     No 27,195 (89.5) 21,584 (79.4) 4,692 (17.3) 919 (3.4)
     Yes 3,174 (10.5) 2,711 (85.4) 414 (13.1) 49 (1.5)
    Awkward postures <0.001
     No 20,143 (66.2) 15,698 (77.9) 3,666 (18.2) 779 (3.9)
     Yes 10,288 (33.8) 8,648 (84.1) 1,448 (14.1) 192 (1.9)
    Heavy physical workload 0.002
     No 21,890 (72.0) 17,345 (79.2) 3,769 (17.2) 776 (3.5)
     Yes 8,520 (28.0) 6,983 (82.0) 1,344 (15.8) 193 (2.3)
    Prolonged standing <0.001
     No 12,367 (40.7) 9,132 (73.8) 2,603 (21.1) 632 (5.1)
     Yes 18,052 (59.3) 15,209 (84.2) 2,505 (13.9) 338 (1.9)
    Repetitive movements <0.001
     No 12,234 (40.2) 9,419 (77.0) 2,334 (19.1) 481 (3.9)
     Yes 18,171 (59.8) 14,900 (82.0) 2,784 (15.3) 487 (2.7)
    Low job control <0.001
     No 23,982 (78.9) 19,071 (79.5) 4,066 (17.0) 845 (3.5)
     Yes 6,395 (21.1) 5,224 (81.7) 1,049 (16.4) 122 (1.9)
    Effort-reward imbalance 0.626
     No 26,784 (88.6) 21,415 (80.0) 4,532 (16.9) 837 (3.1)
     Yes 3,446 (11.4) 2,759 (80.1) 561 (16.3) 126 (3.6)
    Organizational injustice 0.873
     No 27,664 (91.2) 22,110 (79.9) 4,679 (16.9) 875 (3.2)
     Yes 2,657 (8.8) 2,127 (80.1) 437 (16.4) 93 (3.5)
    Back pain
    		 Upper extremity pain
    		 Lower extremity pain
    Total (–) (+) p-value Total (–) (+) p-value Total (–) (+) p-value
    Daily commuting time (minutes)
     ≤60 24,335 (80.0) 18,724 (76.9) 5,611 (23.1) <0.001 24,327 (80.0) 17,550 (72.1) 6,777 (27.9) 0.002 24,328 (80.0) 21,016 (86.4) 3,312 (13.6) 0.966
     61–120 5,123 (16.8) 3,793 (74.0) 1,330 (26.0) 5,121 (16.8) 3,622 (70.7) 1,500 (29.3) 5,124 (16.8) 4,416 (86.2) 708 (13.8)
     >120 970 (3.2) 637 (65.7) 333 (34.3) 968 (3.2) 613 (63.3) 355 (36.7) 970 (3.2) 838 (86.4) 132 (13.6)
    Weekly working hours
     35–40 20,485 (66.4) 16,143 (78.8) 4,342 (21.2) <0.001 20,473 (66.3) 15,151 (74.0) 5,322 (26.0) <0.001 20,475 (66.3) 18,086 (88.3) 2,389 (11.7) <0.001
     41–52 7,988 (25.9) 5,710 (71.5) 2,278 (28.5) 7,985 (25.9) 5,473 (68.5) 2,512 (31.5) 7,989 (25.9) 6,703 (83.9) 1,286 (16.1)
     >52 2,400 (7.8) 1,591 (66.3) 809 (33.7) 2,399 (7.8) 1,440 (60.0) 959 (40.0) 2,398 (7.8) 1,873 (78.1) 525 (21.9)
    Shift work
     (–) 27,568 (89.6) 21,096 (76.5) 6,472 (23.5) <0.001 27,557 (89.6) 19,835 (72.0) 7,722 (28.0) <0.001 27,561 (89.6) 23,996 (87.1) 3,565 (12.9) <0.001
     (+) 3,213 (10.4) 2,279 (70.9) 934 (29.1) 3,212 (10.4) 2,164 (67.4) 1,048 (32.6) 3,210 (10.4) 2,586 (80.6) 624 (19.4)
    Weekly working hours
     35–40 hours
      Commuting time (minutes)
       ≤60 15,907 (78.7) 12,675 (79.7) 3,232 (20.3) <0.001 15,900 (78.7) 11,866 (74.6) 4,034 (25.4) <0.001 15,898 (78.7) 14,044 (88.3) 1,854 (11.7) 0.774
       61–120 3,574 (17.7) 2,783 (77.9) 791 (22.1) 3,572 (17.7) 2,641 (73.9) 931 (26.1) 3,575 (17.7) 3,163 (88.5) 412 (11.5)
       >120 734 (3.6) 494 (67.3) 240 (32.7) 733 (3.6) 462 (63.0) 271 (37.0) 733 (3.6) 638 (87.1) 95 (12.9)
     41–52 hours
      Commuting time (minutes)
       ≤60 6,449 (81.9) 4,705 (73.0) 1,744 (27.0) 0.003 6,448 (81.9) 4,467 (69.3) 1,981 (30.7) 0.160 6,452 (81.9) 5,414 (83.9) 1,038 (16.1) 0.662
       61–120 1,226 (15.6) 809 (66.0) 417 (34.0) 1,227 (15.6) 794 (64.7) 433 (35.3) 1,227 (15.6) 1,015 (82.7) 212 (17.3)
       >120 202 (2.6) 125 (61.8) 77 (38.2) 202 (2.6) 133 (65.9) 69 (34.1) 202 (2.6) 174 (86.3) 28 (13.8)
     >52 hours
      Commuting time (minutes)
       ≤60 1,979 (84.7) 1,344 (67.9) 635 (32.1) 0.200 1,980 (84.7) 1,218 (61.5) 762 (38.5) 0.569 1,979 (84.7) 1,558 (78.7) 421 (21.3) 0.358
       61–120 323 (13.8) 201 (62.4) 122 (37.6) 323 (13.8) 187 (58.0) 136 (42.0) 323 (13.8) 239 (74.0) 84 (26.0)
       >120 35 (1.5) 19 (53.6) 16 (46.4) 34 (1.5) 18 (53.4) 16 (46.6) 35 (1.5) 26 (74.1) 9 (25.9)
    Shift work
     Commuting time (minutes)
      (–)
       ≤60 21,562 (85.4) 16,713 (77.5) 4,849 (22.5) <0.001 21,556 (79.4) 15,644 (72.6) 5,912 (27.4) 0.003 21,556 (79.4) 18,752 (87.0) 2,804 (13.0) 0.880
       61–120 4,687 (13.1) 3,503 (74.7) 1,184 (25.3) 4,685 (17.3) 3,349 (71.5) 1,336 (28.5) 4,688 (17.3) 4,086 (87.2) 602 (12.8)
       >120 918 (1.5) 608 (66.2) 310 (33.8) 917 (3.4) 583 (63.6) 334 (36.4) 918 (3.4) 806 (87.8) 112 (12.2)
      (+)
       ≤60 2,710 (85.4) 1,959 (72.3) 751 (27.7) 0.179 2,709 (85.4) 1,854 (68.4) 855 (31.6) 0.358 2,708 (85.4) 2,205 (81.4) 503 (18.6) 0.055
       61–120 414 (13.0) 277 (66.8) 137 (33.2) 415 (13.1) 263 (63.4) 152 (36.6) 414 (13.1) 314 (75.9) 100 (24.1)
       >120 49 (1.5) 28 (56.8) 21 (43.2) 49 (1.5) 29 (59.3) 20 (40.7) 49 (1.5) 29 (59.7) 20 (40.3)
    Odds ratio (95% confidence interval)
    Back pain
    		 Upper extremity pain
    		 Lower extremity pain
    Unadjusted Model 1a Model 2b Unadjusted Model 1a Model 2b Unadjusted Model 1a Model 2b
    Daily commuting time (minutes)
     ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
     61–120 1.17 (1.04–1.32) 1.33 (1.17–1.51) 1.33 (1.16–1.52) 1.07 (0.96–1.20) 1.29 (1.14–1.46) 1.29 (1.13–1.46) 1.02 (0.88–1.18) 1.23 (1.05–1.44) 1.24 (1.05–1.45)
     >120 1.74 (1.34–2.26) 2.24 (1.67–3.00) 2.41 (1.77–3.29) 1.50 (1.17–1.92) 2.07 (1.57–2.72) 2.27 (1.71–3.00) 1.00 (0.76–1.31) 1.30 (0.98–1.73) 1.53 (1.13–2.08)
    Weekly working hours
     35–40 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
     41–52 1.48 (1.35–1.63) 1.41 (1.27–1.56) 1.36 (1.23–1.52) 1.31 (1.19–1.43) 1.23 (1.12–1.36) 1.19 (1.08–1.32) 1.45 (1.29–1.63) 1.32 (1.17–1.49) 1.26 (1.11–1.43)
     >52 1.89 (1.64–2.17) 1.50 (1.29–1.76) 1.44 (1.24–1.69) 1.90 (1.66–2.17) 1.58 (1.37–1.82) 1.54 (1.33–1.78) 2.12 (1.81–2.49) 1.69 (1.41–2.02) 1.65 (1.38–1.97)
    Shift work
     (–) 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
     (+) 1.34 (1.17–1.52) 1.18 (1.02–1.36) 1.2 (1.04–1.39) 1.24 (1.10–1.41) 1.06 (0.92–1.22) 1.09 (0.95–1.25) 1.62 (1.39–1.90) 1.36 (1.14–1.63) 1.39 (1.17–1.66)
    Weekly working hours
     35–40 hours
      Commuting time (minutes)
       ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
       61–120 1.12 (0.96–1.29) 1.3 (1.11–1.52) 1.32 (1.13–1.55) 1.04 (0.91–1.19) 1.27 (1.10–1.47) 1.29 (1.11–1.51) 0.99 (0.82–1.18) 1.23 (1.01–1.49) 1.27 (1.04–1.54)
       >120 1.90 (1.37–2.64) 2.43 (1.68–3.49) 2.55 (1.75–3.71) 1.72 (1.28–2.32) 2.36 (1.70–3.27) 2.52 (1.82–3.48) 1.13 (0.81–1.57) 1.42 (1.00–2.01) 1.63 (1.12–2.36)
     41–52 hours
      Commuting time (minutes)
       ≤60 1.45 (1.31–1.61) 1.44 (1.29–1.60) 1.37 (1.22–1.53) 1.30 (1.18–1.44) 1.25 (1.13–1.39) 1.20 (1.08–1.34) 1.45 (1.28–1.64) 1.37 (1.20–1.56) 1.29 (1.12–1.47)
       61–120 2.02 (1.61–2.54) 2.07 (1.61–2.67) 1.87 (1.43–2.45) 1.60 (1.28–2.01) 1.75 (1.37–2.23) 1.60 (1.23–2.09) 1.58 (1.17–2.14) 1.69 (1.22–2.33) 1.50 (1.08–2.09)
       >120 2.43 (1.54–3.82) 2.85 (1.73–4.69) 2.83 (1.70–4.70) 1.52 (0.97–2.39) 1.89 (1.14–3.12) 2.04 (1.19–3.50) 1.21 (0.71–2.05) 1.50 (0.86–2.61) 1.73 (1.01–2.97)
     > 52 hours
      Commuting time (minutes)
       ≤60 1.85 (1.59–2.16) 1.65 (1.41–1.94) 1.46 (1.24–1.73) 1.84 (1.60–2.12) 1.68 (1.45–1.96) 1.60 (1.37–1.86) 2.05 (1.71–2.44) 1.81 (1.49–2.19) 1.66 (1.37–2.01)
       61–120 2.37 (1.67–3.36) 2.21 (1.51–3.24) 1.85 (1.25–2.73) 2.13 (1.52–3.00) 1.99 (1.38–2.86) 1.73 (1.20–2.51) 2.67 (1.82–3.91) 2.40 (1.58–3.66) 2.08 (1.35–3.21)
       >120 3.39 (1.38–8.32) 3.25 (1.14–9.26) 2.79 (0.88–8.87) 2.56 (1.05–6.27) 2.54 (0.92–7.01) 2.17 (0.75–6.26) 2.65 (1.01–6.96) 2.51 (0.88–7.18) 2.08 (0.67–6.46)
    Shift work
     (–)
      Commuting time (minutes)
       ≤60 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
       61–120 1.16 (1.03–1.32) 1.32 (1.16–1.50) 1.31 (1.15–1.51) 1.06 (0.94–1.19) 1.28 (1.12–1.45) 1.28 (1.12–1.46) 0.99 (0.85–1.14) 1.19 (1.02–1.40) 1.19 (1.01–1.40)
       >120 1.76 (1.34–2.31) 2.25 (1.65–3.07) 2.45 (1.77–3.38) 1.52 (1.17–1.96) 2.10 (1.58–2.80) 2.34 (1.75–3.12) 0.93 (0.69–1.24) 1.21 (0.89–1.65) 1.43 (1.03–1.98)
     (+)
      Commuting time (minutes)
       ≤60 1.32 (1.16–1.51) 1.22 (1.06–1.40) 1.18 (1.02–1.37) 1.22 (1.07–1.39) 1.09 (0.95–1.25) 1.09 (0.94–1.25) 1.53 (1.30–1.79) 1.35 (1.14–1.61) 1.32 (1.10–1.57)
       61–120 1.71 (1.11–2.63) 1.78 (1.08–2.93) 1.78 (1.09–2.92) 1.53 (1.02–2.30) 1.53 (0.95–2.46) 1.49 (0.92–2.41) 2.12 (1.27–3.56) 2.08 (1.14–3.78) 2.10 (1.15–3.82)
       >120 2.62 (1.20–5.71) 2.54 (1.09–5.88) 2.10 (0.87–5.10) 1.81 (0.83–3.94) 1.69 (0.74–3.83) 1.35 (0.56–3.25) 4.52 (2.10–9.74) 4.38 (1.77–10.85) 3.85 (1.47–10.08)
    Table 1. Characteristics of the study participants according to daily commuting time

    Values are presented as number (%).

    Table 2. The prevalence of back pain, upper extremity pain, and lower extremity pain by daily commuting time, weekly working hours, and shift work (including stratified analysis by weekly working hours and shift work)

    Values are presented as number (%).

    Table 3. Musculoskeletal pains and their association with daily commuting time, weekly working hours, and shift work by logistic regression analysis (including stratified analysis by weekly working hours and shift work)

    Model 1: Adjusted for sex, age, education, income, occupation, employment status, commuting time (not adjusted in the commuting time table), working hours (not adjusted in the weekly working hours table), shift work (not adjusted in the shift work table), low job control, effort-reward imbalance, and organizational injustice.

    bModel 2: Adjusted for sex, age, education, income, occupation, employment status, commuting time (not adjusted in the commuting time table), working hours (not adjusted in the weekly working hours table), shift work (not adjusted in the shift work table), low job control, effort-reward imbalance, organizational injustice, awkward postures, heavy physical workload, prolonged standing, and repetitive movements.

    Table 1.

    Table 2.

    Table 3.

    Ann Occup Environ Med : Annals of Occupational and Environmental Medicine
    © Korean Society of Occupational & Environmental Medicine.
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