Odds ratios for breast cancer among current users of menopausal hormone therapy by time interval between start of menopause and start of MHT usea.

aAnalyses restricted to current users of MHT who used only one type of MHTbOdds Ratios adjusted for study area / Age at reference date/ Age at menarche / Parity / Age at first full-term pregnancy / Breast feeding /History of benign breast disease / Family history of breast cancer in first degree relatives / BMI / Oral contraceptive use.