The age-adjusted genetic, shared and non-shared (individual specific) environmental influences on variance of serum vitamin D levels (95% CI) among 204 Swedish adult twins.
†The multivariate model has a combined coefficient of determination of 0.27. All five variables were included in multivariate analysis.‡Within the last 30 days.§≥5 µg/day.¶Within the last 6 months.††S
