Risk factor categories in the GM were formed by using information from the screening questionnaire age at menarche at least 14 years, 12 to 13 years, or fewer than 12 years, age at first live birth nulliparous, fewer than 20 years, 20 to 24 years, 25 to 29 years, or at least 30 years, previous breast biopsy, and number of first degree relatives with breast cancer
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