Fig. 2

Percent vitamin D status in different occupational groups. Vitamin D deficiency (white bars) was defined according to the Endocrine Society’s (ES) categorization as a serum level of 25-(OH)D ≤ 50 nmol/L (20 ng/ml). Each white bar graph represents % of subjects of each group with a serum 25-(OH)D ≤ 50 nmol/L. The black bars represent percent vitamin D deficiency or insufficiency in different occupational groups. Vitamin D insufficiency was defined based on the ES’s criteria, which indicates a serum level of 25-(OH)D ≤ 75 nmol/L (30 ng/ml) as insufficient. Each black bar graph represents the % of subjects of each group with a serum 25-(OH)D level ≤ 75 nmol/L. The numbers within the bars, N, represent the total number of subjects contributing to each category for whom vitamin D deficiency, insufficiency, or sufficiency could be determined