Journal
DIABETES CARE
Volume 34, Issue 3, Pages 628-634Publisher
AMER DIABETES ASSOC
DOI: 10.2337/dc10-1632
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Funding
- National Heart, Lung, and Blood Institute, National Institutes of Health [N01WH22110, 24152, 32100-2, 32105-6, 32108-9, 32111-13, 32115, 32118-32119, 32122, 42107-26, 42129-32, 44221]
- National Institutes of Health (National Cancer Institute
- National Heart, Lung, and Blood Institute)
- Abbott
- Bristol-Myers Squibb
- Daiichi-Sankyo
- GlaxoSmithKline
- Hoffmann-La Roche
- Merck
- Merck Schering-Plough
- Amgen
- Eli Lilly and Company
- NPS Pharmaceuticals
- Baxter Healthcare
- InteKrin
- Johnson Johnson
- MannKind
- MedPace
- NPS
- Pfizer
- Procter Gamble
- sanofi-aventis
- Takeda Pharmaceuticals
- Vivus
- Warner Chilcott
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OBJECTIVE-To examine whether lower serum levels of serum 25-hydroxyvitamin (OH) D 125(OH)D] are associated with increased risk of developing type 2 diabetes. RESEARCH DESIGN AND METHODS-A post hoc analysis of three nested case-control studies of fractures, colon cancer, and breast cancer that measured serum 25(OH)D levels in women participating in the Women's Health Initiative (WHI) Clinical Trials and Observational Study who were free of prevalent diabetes at baseline. Diabetes was defined as self-report of physician diagnosis or receiving insulin or oral hypoglycemic medication. We used inverse probability weighting to make the study population representative of the WHI population as a whole. Weighted logistic regression models compared 25(OH)D levels (divided into quartiles, clinical cut points [< 50, 50-< 75, >= 75 nmol/L], or as a continuous variable) using the distribution of control subjects and adjusted for multiple confounding factors. RESULTS-Of 5,140 women (mean age 66 years) followed for an average of 7.3 years, 317 (6.2%) developed diabetes. Regardless of the cut points used or as a continuous variable, 25(OH)D levels were not associated with diabetes incidence in either age or fully adjusted models. Nor was any relationship found between 25(OH)D and incident diabetes when evaluated by strata of BMI, race/ethnicity, or randomization status in the Calcium Vitamin D trial. CONCLUSIONS-Lower serum 25(OH)D levels were not associated with increased risk of developing type 2 diabetes in this racially and ethnically diverse population of postmenopausal women.
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