Annals of Occupational and Environmental Medicine

Seungho Ryu

2 Articles

Comparison of sleep quality based on direction of shift rotation in electronics workers: Youil Shon, Seungho Ryu, Byung-Seong Suh, Soo-Geun Kim, Won-Sool Kim, Hee-Seung Son, Hee-Yun Kim, Han-Seur Jeong; Ann Occup Environ Med 2016;28:37. Published online September 5, 2016; DOI: https://doi.org/10.1186/s40557-016-0122-3

Background

Previous studies have reported the effects of direction of shift rotation on sleep, however, the findings are inconsistent. In this study, we investigated sleep quality related to direction of shift rotation using large-scale data from shiftwork-specific health examinations of electronics workers.

Methods

This study included 4750 electronics workers working in a rotating 3-shift system who completed a medical examination for shift workers survey from January 1 to December 31, 2014, at a general hospital. The subjects were categorized into one of two groups according to direction of shift rotation. We compared sleep quality index between the subjects who worked in forward rotation and backward rotation systems.

Results

Backward rotation was positively associated with prevalence of poor sleep quality. In the multivariable-adjusted model, when comparing backward rotation to forward rotation, the odds ratio (OR) with 95 % confidence interval (95 % CI) for poor sleep quality was 1.95 (1.58–2.41). After stratifying by gender, the ORs (95 % CIs) for poor sleep quality in male and female was 1.92 (1.47–2.49) and 2.13 (1.47–3.08), respectively. In subgroup analyses, backward rotation was significantly associated with poor sleep quality in workers ≥30 years of age compared with workers <30 years of age (adjusted OR 2.60 vs. 1.89, respectively; P for interaction <0.001).

Conclusions

Our study supports that a backward rotation system is associated with poor sleep quality. Forward rotation systems should be considered to reduce sleep problems.

Citations

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Job Stress and Psychosocial Stress among Firefighters: Jaehyeok Ha, Dong Il Kim, Byung Sung Seo, Won Sool Kim, Seungho Ryu, Soo Geun Kim; Korean Journal of Occupational and Environmental Medicine 2008;20(2):104-111. Published online June 30, 2008; DOI: https://doi.org/10.35371/kjoem.2008.20.2.104

Abstract PDF

OBJECTIVES
This study was performed to assess the level of job and psychosocial stresses in Korean firefighters, and to evaluate the determinants of psychosocial stress.
METHODS
The study subjects comprised 1,712 male firefighters working in Seoul, Busan, and Kyungnam in 2006. We collected information about demographic and job-related characteristics, healthrelated behaviors, Korean Occupational Stress Scale (KOSS), and psychosocial Well-being Index (PWI) through self-administered questionnaires. Statistical analyses were done by using the chi-square-test and logistic regression model.
RESULTS
The multiple logistic regression analyses indicated that the proportion of high-risk psychosocial stress is significantly higher in the groups with high job stress level in 'lack of rewards' (OR=2.90, 95% CI=2.18-3.85), 'occupational climate' (OR=1.92, 95% CI=1.47-2.51), 'job demand' (OR=1.72, 95% CI=1.32-2.23), 'job insecurity' (OR=1.53, 95% CI=1.17-2.01), 'interpersonal conflict' (OR=1.53, 95% CI=1.16-2.01), 'physical environment' (OR=1.45, 95% CI=1.11-1.89), and 'organizational injustice' (OR=1.38, 95% CI=1.04-1.85).
CONCLUSIONS
Psychosocial stress might be adversely influenced by job stressors for the most part. Firefighters need job stress management to minimize their psychological problems.

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