Abstract
EVIDENCE-BASED ANSWER The overall prevalence of vitamin D deficiency (25-hydroxyvitamin D levels <30 nmol/L) in the United States is 8.1% and is slightly higher in females (9.9%) than males (6.3%). Mexican Americans (11%), and non-Hispanic blacks (31%) have a higher prevalence than whites (3.6%). In adolescents, the prevalence is 8.5% to 24.1% using 30 to 37.5 nmol/L cutoffs. Breastfed infants not receiving vitamin supplements have a prevalence of 64%. The data on children are inconsistent, with rates ranging from 0.7% to 40% (SOR: C, cross-sectional studies of diseaseoriented data).
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