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Mean (SD) serum 25(OH)D concentration by season, occupation, and sex. Bars indicate mean measured 25(OH)D concentrations (ng/mL) in summer (red bars) and winter (blue bars) ± SDs, summer n = 318, winter n = 307. Summer: Indoor < Outdoor, Males > Females, Indoor, Females < Indoor, Males = Outdoor, Males = Outdoor, Females, p < 0.05. Winter: Indoor = Outdoor, Males = Females, Indoor, Males = Indoor, Females = Outdoor, Males = Outdoor, Females, p < 0.05.
