Objectives To assess the association between working patterns and vitamin D status in men and women and to determine the potential influence of related lifestyle and socioeconomic factors.
Methods The authors used data from the 1958 British birth cohort (aged 45 years) and 6154 participants, who were in full-time work, were included in current analyses. Vitamin D status was measured by circulating concentrations of 25-hydroxyvitamin D (25(OH)D). Information on working patterns and lifestyle factors was obtained using a structured questionnaire administered at 45 years.
Results Manual social class was strongly associated with vitamin D-related lifestyle factors, with those in manual classes not only spending more time outdoors, but also spending more time watching TV/using PC, consuming less supplements and oily fish. Associations between working patterns and vitamin D-related lifestyles were less clear: night work was not strongly associated with lifestyles in either gender, while working hours were associated with time spent outside, PC/TV leisure time and use of supplements in men but not in women. In men, working patterns were not associated with lower 25(OH)D concentrations. In women, 25(OH)D concentrations were 8% lower (95% CI 15% to 2%) in night workers compared with others, while women working less than 35 h/week had 5% higher concentrations of 25(OH)D (95% CI 1% to 8%) compared with those working 35–40 h/week after adjustment for season, social class and body mass index (BMI).
Conclusions Women working nights and longer hours may be vulnerable to deficits in vitamin D status and associated health hazards.
- Vitamin D
- occupational status
- health behaviour
- public health
- preventive medicine
- shift work
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Funding MW is funded by the Child Health Research Appeal Trust (CHRAT) studentship and EH by the Department of Health (UK) Public Health Career Scientist Award. Data collection at age 44–46 years and statistical analyses were funded by the UK Medical Research Council (grants G0000934, G0601653), 25(OH)D assays by The BUPA Foundation. This work was undertaken at GOSH/UCL Institute of Child Health which received a proportion of funding from the Department of Health's NIHR Biomedical Research Centres funding scheme. MRC provided support for the MRC Centre of Epidemiology for Child Health.
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the South East Multi-Centre Research Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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