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. 2014 Sep;100(3):982–984. doi: 10.3945/ajcn.114.090605

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FIGURE 1. — Serum 25(OH)D reference distribution with a comparison of observed serum 25(OH)D concentrations for adults aged 19–70 y in NHANES 2005–2006 (n = 3871) with the observed distribution shifted so that 97.5% of the sample achieve 20 ng/mL. The reference distribution was derived by using the mean (95th percentile) specified by the Institute of Medicine (2) with a calculated SD = 5.0 nmol/L on the basis of normality. The estimated probability function indicates the frequency of each concentration in the sample. Modified from reference 6 and reproduced with permission from the American Journal of Clinical Nutrition. EAR, Estimated Average Requirement; RDA, Recommended Dietary Allowance; UL, Tolerable Upper Level; 25(OH)D, 25-hydroxyvitamin D.