Moderating Effects of Psychological Job Strain on the Relationship between Working Hours and Health: An Examination of White-Collar Workers Employed by a Japanese Manufacturing Company

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  • Tarumi Kimio
    Section of Postgraduates Guidance, University of Occupational and Environmental Health
  • Hagihara Akihito
    Department of Health Services Management and Policy, Kyushu University Graduate School of Medicin
  • Morimoto Kanehisa
    Department of Hygiene and Preventive Medicine, Osaka University Graduate School of Medicine

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  • Moderating Effects of Psychological Job Strain on the Relationship between Working Hours and Health: An Examination of White‐Collar Workers Employed by a Japanese Manufacturing Company

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The effects of working hours on health were examined taking psychological job strain into account. White-collar workers employed at the main office of a Japanese manufacturing company provided data for analysis done in 1997. The eligible subjects were 286 workers aged 20-39. Causal relationships between working hours, health, and psychological job strain were examined by covariance structure analyses. The main findings were as follows: Not only working hours but also sleeping hours and vacations affected the workers’ effort to deal with work as a work-related hour factor. Decision authority and skill discretion of Karasek’s psychological job strain items significantly constituted a discretion in the work factor, and this factor moderated the effects of the work-related hour factor on health. The effects of psychological job strain, especially discretion, must always be taken into account in examinations of working hours and health.<br>

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