Association of long working hours with accidents and suicide mortality in Korea
- Authors
- Lee, Hye-Eun; Kim, Inah; Kim, Hyoung-Ryoul; Kawachi, Ichiro
- Issue Date
- 2020
- Publisher
- SCANDINAVIAN JOURNAL WORK ENVIRONMENT & HEALTH
- Keywords
- depression; injury; karoshi; KNHANES; Korean National Health and Nutrition Examination Survey; mental health; occupational; overwork; work hour; working time; work time
- Citation
- SCANDINAVIAN JOURNAL OF WORK ENVIRONMENT & HEALTH, v.46, no.5, pp.480 - 487
- Indexed
- SCIE
SSCI
SCOPUS
- Journal Title
- SCANDINAVIAN JOURNAL OF WORK ENVIRONMENT & HEALTH
- Volume
- 46
- Number
- 5
- Start Page
- 480
- End Page
- 487
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/146514
- DOI
- 10.5271/sjweh.3890
- ISSN
- 0355-3140
- Abstract
- Objectives The deleterious health effects of long working hours have been previously investigated, but there is a dearth of studies on mortality resulting from accidents or suicide. This prospective study aims to examine the association between working hours and external-cause mortality (accidents and suicide) in Korea, a country with some of the longest working hours in the world. Methods Employed workers (N=14 484) participating in the Korean National Health and Nutrition Examination Survey (KNHANES) were matched with the Korea National Statistical Office's death registry from 2007-2016 (person-years = 81 927.5 years, mean weighted follow-up duration = 5.7 years). Hazard ratios (HR) for accident (N=25) and suicide (N=27) mortality were estimated according to weekly working hours, with 35-44 hours per week as the reference. Results Individuals working 45-52 hours per week had higher risk of total external cause mortality compared to those working 35-44 hours per week [HR 2.79, 95% confidence interval (CI) 1.22-6.40], adjusting for sex, age, household income, education, occupation, and depressive symptoms. Among the external causes of death, suicide risk was higher (HR 3.89, 95% CI 1.06-14.29) for working 45-52 hours per week compared to working 35-44 hours per week. Working >52 hours per week also showed increased risk for suicide (HR 3.74, 95% CI 1.03-13.64). No statistically significant associations were found for accident mortality. Conclusions Long working hours are associated with higher suicide mortality rates in Korea.
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