Sunlight and other determinants of circulating 25-hydroxyvitamin D levels in black and white participants in a nationwide U.S. study

Freedman, D. Michal, Cahoon, Elizabeth K., Rajaraman, Preetha, Major, Jacqueline M., Doody, Michele M., Alexander, Bruce H., Hoffbeck, Richard W., Kimlin, Michael G., Graubard, Barry I., & Linet, Martha S. (2013) Sunlight and other determinants of circulating 25-hydroxyvitamin D levels in black and white participants in a nationwide U.S. study. American Journal of Epidemiology, 177(2), pp. 180-192.

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Abstract

Circulating 25-hydroxyvitamin D (25(OH)D), a marker for vitamin D status, is associated with bone health and possibly cancers and other diseases; yet, the determinants of 25(OH)D status, particularly ultraviolet radiation (UVR) exposure, are poorly understood. Determinants of 25(OH)D were analyzed in a subcohort of 1,500 participants of the US Radiologic Technologists (USRT) Study that included whites (n 842), blacks (n 646), and people of other races/ethnicities (n 12). Participants were recruited monthly (20082009) across age, sex, race, and ambient UVR level groups. Questionnaires addressing UVR and other exposures were generally completed within 9 days of blood collection. The relation between potential determinants and 25(OH)D levels was examined through regression analysis in a random two-thirds sample and validated in the remaining one third. In the regression model for the full study population, age, race, body mass index, some seasons, hours outdoors being physically active, and vitamin D supplement use were associated with 25(OH)D levels. In whites, generally, the same factors were explanatory. In blacks, only age and vitamin D supplement use predicted 25(OH)D concentrations. In the full population, determinants accounted for 25 of circulating 25(OH)D variability, with similar correlations for subgroups. Despite detailed data on UVR and other factors near the time of blood collection, the ability to explain 25(OH)D was modest.

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ID Code: 59530
Item Type: Journal Article
Refereed: Yes
Keywords: Vitamin-D status, D insufficiency, Serum 25-hydroxyvitamin-D, Postmenopausal women, Cutaneous synthesis, Elderly population, African-Americans, Hypovitaminosis-D, Dietary-intake, D deficiency, dietary supplements, race, seasons, sex, sunlight, ultraviolet rays
DOI: 10.1093/aje/kws223
ISSN: 0002-9262
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Deposited On: 05 May 2013 22:36
Last Modified: 07 May 2013 05:03

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