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J Occup Health year 2004 volume 46 number 5 page 345 - 351
Classification Original
Title 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
Author Kimio TARUMI1, Akihito HAGIHARA2 and Kanehisa MORIMOTO3
Organization 1Section of Postgraduates Guidance, University of Occupational and Environmental Health, 2Department of Health Services Management and Policy, Kyushu University Graduate School of Medicine and 3Department of Hygiene and Preventive Medicine, Osaka University Graduate School of Medicine, Japan
Keywords Working hours, Psychological job strain, Covariance structure analysis
Correspondence K. Tarumi, Section of Postgraduates Guidance, School of Medicine, University of Occupational and Environmental Health, Yahatanishiku, Kitakyushu 807-8555, Japan (e-mail: tarumi@med.uoeh-u.ac.jp)
Abstract 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: Kimio TARUMI, et al. Section of Postgraduates Guidance, University of Occupational and Environmental Health-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.