*Multivariate models adjusted for: first morning urine (yes, no), BMI at age 18 (<21, 21–<23, ≥23), age at menarche (<12, 12, 13, ≥14), parity & age at first birth (nulliparous, 1–2 children & <25 yrs, 1–2 children & 25–29 yrs, 1–2 children & ≥30 yrs, ≥3 children & <25 yrs, ≥3 children & ≥25 yrs), family history of breast cancer (yes, no), history of benign breast disease (yes, no)