Annals of Occupational and Environmental Medicine

Original Article

Factors Associated with Quality on Sleep of Subway Workers by Shift-Work: Min Gi Kim, Won Chul Lee, Young Min Lee, Jae Hong Ryoo, Hawn Cheol Kim, Seung Won Yoo, Kyung Han Nam; Korean Journal of Occupational and Environmental Medicine 2008;20(4):326-334. Published online December 31, 2008; DOI: https://doi.org/10.35371/kjoem.2008.20.4.326

BACKGROUND
The sleep quality of subway drivers who work in the dark underground with an rotating shift system is generally poor, which can degrade the quality of a worker's life. This study examined the relationship between the sleep quality of subway worker and shift work by comparing three shift systems (rotating shift system, a three day shift system, and no-shift system).
METHOD
Questionnaires including The short form of the Korean Occupational Stress Scale (KOSS), Pittsburgh Sleep Questionnaire (PSQI), the worker's age, gender, job type, accident, near miss and shift system were given to a total of 1010 workers. The results of 759 qualified questionnaires (75.15 %) were analyzed using the SPSS (ver 12.0) program.
RESULT
The highest level of job stress was found among those working a rotating shift system followed by three shift system and no-shift system. The mean sleep quality score in the rotating shift workers was 5.1 (SD+/-3.2), which was greater than the sleep symptom score (5). 34.8% of rotating shift workers suffered from sleep symptoms. The sleep quality score by shift-work was significantly different. High job demand, strong external locus control, the experience of a near miss or an accident in the workplace during previous year has an adverse affect on the sleep quality. The sleep quality improved in case of a change into a no-shift system or a strong internal locus control.
CONCLUSION
A rotating shift system is more harmful to the quality of sleep in subway workers than a 3 shift system or no-shift system. In addition, job stress, personality, near miss and the experience of an accident affect the sleep quality of subway workers.

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Original Article

A Study on the Sleep Itisorder of a Part of Manufacturing Plant Workers: Jeoung Kyun Rho, Ki Ha Yoo, Young Soo Lee, Young Chae Gho; Korean Journal of Occupational and Environmental Medicine 1994;6(2):377-383. Published online September 30, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.2.377

Abstract PDF

This study was conducted to investigate sleep qualifies of manufacturing workers. The data were collected from the 479 manufacturing factory workers who were most 3 shift workers. The results obtained were as follows. The prevalence rate of sleep disorder was 32.8%, rate of difficulty in initiating sleep was 11.9%, that of difficulty in maintaining sleep was 6.1%, and that of early morning awakening was 6.9%. DisoTdeTs of difficulty in maintaining sleep was low in the age group of twenties and high in thirties. The gloup of sedative or alcohol use before sleep induction shewed high Prevalence Tate of sleep disorder. The group of satisfying for job or family had the lower rate of sleep disorder than the unsatisfying group. The rate of sleep disorder were low in the group of day sleeping, no physical pain. The variables such as day sleep, physical pain and job tenure showed statistical significance in the logistic regression of sleep disorder.

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Chae-Bong Kim, Tae-Young Jung, Seoung-Min Han
The Korean Journal of Health Service Management.2015; 9(1): 41. CrossRef

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