Characteristics of the study population, overall and by quartiles of percent density.
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Abbreviations: BMI = body mass index; OC = oral contraceptive; HRT = hormone replacement therapy. * In parous women only. † Percentage of women with missing values on age at menarche (9.2%), OC use (0.3%), age at first birth (10.5%) and breastfeeding (11.7%).
创建时间：
2015-12-02
