Fig. 1

Hazard ratios of incident breast cancer by strata of calcium channel blocker use (a) and by strata of use of all antihypertensive drugs (b). HRs were calculated using Cox proportional hazards regression with age as the time scale and adjusted for race/ethnicity, categorized BMI, parity, age at menarche, menopause status, statin use, smoking status, hormone therapy use, and reported hours of physical activity per week