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Ann Occup Environ Med. 2018 Oct 23;30:63. doi: 10.1186/s40557-018-0271-7. eCollection 2018.

Factors related with quality on sleep of daytime workers.

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Department of Occupational and Environmental Medicine, Soonchunhyang University Gumi Hospital, 179 1gongdan-ro, Gumi, Gyeongsangbuk-do Republic of Korea.



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


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


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


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


Daytime workers; Sleep; Sleep duration; Sleep quality

Conflict of interest statement

Written consent form was obtained from participants. Ethical approval is obtained by Institutional Review Board (IRB) of Soonchunhyang University Hospital in Seoul. IRB number is Medicine 2018-02.Not applicableThe authors declare that they have no competing interests.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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