Shift work and depressive symptoms: the mediating effect of vitamin D and sleep quality
- Authors
- Park, Hwanjin; Suh, Byungsung; Lee, Soo-Jin
- Issue Date
- 2019
- Publisher
- TAYLOR & FRANCIS INC
- Keywords
- shift work; depressive symptom; sleep quality; Vitamin D
- Citation
- CHRONOBIOLOGY INTERNATIONAL, v.36, no.5, pp.689 - 697
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHRONOBIOLOGY INTERNATIONAL
- Volume
- 36
- Number
- 5
- Start Page
- 689
- End Page
- 697
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/148682
- DOI
- 10.1080/07420528.2019.1585367
- ISSN
- 0742-0528
- Abstract
- Shift work is associated with vitamin D level, sleep quality, and depressive symptoms. Vitamin D and sleep quality are also associated with depressive symptoms. The purpose of this study was to compare vitamin D level, sleep quality, and depressive symptoms between shift workers and daytime workers and analyze the mediating effect of vitamin D and sleep quality between shift work and depressive symptoms. Among those who participated in the Kangbuk Samsung Health Study in 2012 and 2014, 82,078 cases of full-time workers were analyzed. We evaluated their shift work, vitamin D level, sleep quality, and depressive symptoms with blood samples and questionnaires. Chi-square tests, t-tests, and path statistical analysis were performed. More depressive symptoms, lower vitamin D levels, and poorer sleep quality were associated with shift work. According to a path analysis, shift work had both a direct effect and an indirect effect on depressive symptoms, each mediated by sleep quality and vitamin D level. When a multigroup analysis was conducted for each sex, paths containing sleep quality were more significant in female shift workers than male shift workers; paths involving vitamin D did not differ between sexes. To assess depression risk in shift workers, evaluating vitamin D level and sleep quality is essential. Also, sleep problems are more prevalent in female compared to male shift workers with respect depression prevalence.
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