Distribution of serum 25-OH vitamin D levels. Histogram of 25-OH vitamin D levels. The median 25-OH D level in this cohort was 28 ng/mL (IQR 21–37). The majority (54%) of children had levels below current guidelines of sufficiency (30 ng/mL) (dotted line), with almost a quarter (23%) in the deficient (≤ 20 ng/mL) range (dashed line).
Bose et al. Nutrition Journal 2013 12:81 doi:10.1186/1475-2891-12-81