title: Relationship of type of work with health-related quality of life.
abstract: OBJECTIVE
  To examine the relation of work type with health-related quality of life (HRQoL) in healthy workers.
  
  
  METHODS
  We cross-sectionally examined 4427 (3605 men and 822 women) healthy workers in Japan, aged 19-69 years. We assessed HRQoL based on scores for five scales of the SF-36. Multiple regression was applied to examine the relation of work type (nighttime, shift, day to night, and daytime) with the five HRQoL norm-based scores, lower scores of which indicate poorer health status, adjusted for confounding factors, including sleeping duration.
  
  
  RESULTS
  Shiftwork was inversely related to role physical [regression estimate (β) = -2.12, 95 % confidence intervals (CI) -2.94, -1.30, P < 0.001], general health (β = -1.37, 95 % CI -2.01, -0.72, P < 0.001), role emotional (β = -1.24, 95% CI -1.98, -0.50, P < 0.001), and mental health (β = -1.31, 95% CI -2.01, -0.63, P < 0.001) independent of confounding factors, but not to vitality. Day-to-nighttime work was inversely related to all the five HRQoL subscales (Ps 0.012 to <0.001).
  
  
  CONCLUSIONS
  Shiftwork was significantly inversely related to four out of the five HRQoL, except for vitality, and day-to-nighttime work was significantly inversely related to all five HRQoL, independent of demographic and lifestyle factors.
authors.affiliation: Cardiovascular Epidemiology, Kyoto Women's University, Kyoto, Japan.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Kawabe
authors.affiliation: Cardiovascular Epidemiology, Kyoto Women's University, Kyoto, Japan. nakamury@kyoto-wu.ac.jp.|Departments of Public Health, Shiga University of Medical Science, Otsu, Japan. nakamury@kyoto-wu.ac.jp.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Nakamura
authors.affiliation: Department of Community Network and Collaborative Medicine, Kyoto University Hospital, Kyoto, Japan.
authors.forename: Sayuri
authors.initials: S
authors.lastname: Kikuchi
authors.affiliation: Department of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, Sendai, Japan.
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Suzukamo
authors.affiliation: Departments of Medical Statistics, Faculty of Medicine, Toho University, Tokyo, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Murakami
authors.affiliation: Department of Environmental and Occupational Health, Faculty of Medicine, Toho University, Tokyo, Japan.
authors.forename: Taichiro
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Takebayashi
authors.affiliation: Research Center for Lifestyle-Related Diseases, Tokyo, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Okayama
authors.affiliation: Departments of Public Health, Shiga University of Medical Science, Otsu, Japan.
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Miura
authors.affiliation: Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Okamura
authors.affiliation: Department of Epidemiology and Healthcare Research, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuhara
authors.affiliation: Departments of Public Health, Shiga University of Medical Science, Otsu, Japan.
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Ueshima
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life / Q000523:psychology*; D014937:Work / Q000523:psychology*; D055815:Young Adult
keywords: Health-related quality of life; SF-36; Shift work