Fig. 1

Trends of mammographic measures for different patterns of use of menopause hormone therapy (MHT). Trends by age of percent mammographic density, dense area and non-dense area for a hypothetical woman who never used MHT (black); one who started MHT use at the age of 55 and never stopped (orange); one who started at the age of 55 and stopped at the age of 58 (green); one who started at the age of 55 and stopped at the age of 61 (blue); and one who started at the age of 55 and stopped at the age of 63 (magenta). Lines are from models including age at mammogram, MHT status (never vs ever), duration of use for ever users (continuous linear) and time since last use for past users (continuous quadratic)