Global vitamin D levels in relation to age, gender, skin pigmentation and latitude: an ecologic meta-regression analysis

Abstract
We performed a meta-analysis of cross-sectional studies on serum 25(OH)D status globally. Serum 25(OH)D levels on average were 54 nmol/l, were higher in women than men, and higher in Caucasians than in non-Caucasians. There was no trend in serum 25(OH)D level with latitude. Vitamin D deficiency was widespread.

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