Mammographic percent density (%MD) by month the mammogram was taken, vitamin D intake (quartiles), and calcium intake (quartiles) in women overall, <55 and > = 55 years at mammography.

¹Least square means mutually adjusted (for age (continuous), body mass index (continuous), estrogen and progestin therapy (never, past and current), parity (0, 1,2 or ≥3), educational level (≤10 years, 11–14 years and ≥15 years) and study year (0 = 2004 or 1 = 2006/07)
Calcium and energy (continuous) (estimated from diet including supplements)
²Total = diet plus supplements
3Likelihood ratio test is done on a nested model including variables as described in 1 compared to a model including sinusoidal function on month the mammogram was taken.
Mammographic percent density (%MD) by month the mammogram was taken, vitamin D intake (quartiles), and calcium intake (quartiles) in women overall, <55 and > = 55 years at mammography.