Figure 3.

Kaplan-Meier estimates of cumulative hazards of ductal carcinoma in situ by trial arm assignment and reported personal use of calcium plus vitamin D supplements over time. Hazard ratios (HRs) and 95% confidence intervals (CIs) were adjusted for age, race, body mass index, hormone therapy enrollment and randomization, dietary modification enrollment and randomization, years since menopause, physical activity, and Gail score for breast cancer risk. Incidence rate per 1000 person-years was calculated at 5, 10, 15, 20, and 20 or more years of follow-up.