Figure 1.

Associations of mammographic percent density (PD) with reproductive factors among screening-age (40–74 years) non-Hispanic white women undergoing full-field digital mammography, by machine manufacturer (black circles indicate Hologic machines (Hologic, Inc., Marlborough, Massachusetts); gray circles indicate General Electric machines (General Electric Company, Boston, Massachusetts)) and overall (results combined via meta-analysis, indicated by white diamonds), Kaiser Permanente Northern California, 2003–2013. Reference categories: menopausal status—postmenopausal; parity—2 children; age at menarche—12–13 years; age at first birth—20–24 years. Bars, 95% confidence intervals (CIs).