Figure 3From: Digital mammographic density and breast cancer risk: a case–control study of six alternative density assessment methodsMutually-adjusted associations of known determinants of mammographic density with percent density (PD) readings in control women. PD readings are the mean of four breast/view readings per woman (except for Quantra and single x-ray absorptiometry - see Methods). BMI, body mass index; HT, hormonal therapy; OC, oral contraceptives; Pt, P for linear trend.Back to article page