
Serum 25‐hydroxyvitamin D (S‐25OHD) is used to assess vitamin D status and is known to be affected by season and fat mass. Because these factors are often ignored when interpreting S‐25OHD, assessment of vitamin D associations with disease outcomes may be distorted. We aimed to investigate the impact of season of blood draw and fat mass on the association of S25OHD with fracture risk. We enrolled 5000 women, mean ± SD age 68 ± 7 years, with dual‐energy x‐ray absorptiometry (DXA) scans and blood collection in a population‐based cohort. Proportional hazards regression, stratified by season and fat mass, was used to determine hazard ratios (HRs) of fracture according to categories of S‐25OHD. Our secondary exposures were serum 1,25‐dihydroxycholecalciferol (1,25‐(OH)2 D3), the most active vitamin D metabolite and plasma parathyroid hormone (P‐PTH)...
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