Differences in z-score (number of SD from age corrected mean) of femoral neck bone mineral density according to serum 25-hydroxyvitamin D categories at baseline (N = 4782).

Abbreviations: CI confidence interval.
1F-test (type 3).
2Adjusted for age at recruitment, sex (when all subjects are included), height, body mass index, current smoking, season of blood sampling and alcohol intake.
3Additionally adjusted for current physical activity.