In a study involving a random selection of 620 black and 416 white, 35-49 year old women who were members of an urban health plan during 1996-1999, only 10% of black women and 50% of white women were found to have sufficient levels of vitamin D (>20 ng/mL), and women with sufficient vitamin D status were found to have a 32% lower odds of fibroids, as compared to those with vitamin D insufficiency. Exposure to the sun of at least 1 hour per day was also associated with a reduced odds of fibroids. The authors conclude, "The consistency of findings for questionnaire and biomarker data, the similar patterns seen in blacks and whites, and the biological plausibility provide evidence that sufficient vitamin D is associated with a reduced risk of uterine fibroids.
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