Distribution of 25-hydroxyvitamin D concentration by background, lifestyle and social characteristics in the 1958 British birth cohort.

*Values are n (%) or geometric mean. p-values from test for trend in linear or logistic regression adjusted for season and sex. Unknown values excluded.**Waist circumference quartiles: for men; 65.4–90.6, 90.7–96.7, 96.8–103.5, 103.6–151.2 cm; for women; 56.2–75.8, 75.9–82.6, 82.7–91.6, 91.7–138.3 cm.†Classes I&II are managerial/professional, IV/V unskilled manual. “Other” includes cohort members who are institutionalised, retired, unemployed and other unclassifiable.