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We estimated odds ratios and 95% confidence intervals using multivariable logistic regression, stratified by age (&lt;50, \u226550\u2009years) and ethnicity, for 5,186 HR+ (ER+ or PR+) cases, 1,365 HR\u2212 (ER\u2212 and PR\u2212) cases and 7,480 controls. For HR+ BC, later menarche and earlier menopause were associated with lower risk in non\u2010Hispanic whites (NHWs) and Hispanics, and higher parity and longer breast\u2010feeding were associated with lower risk in Hispanics and Asian Americans, and suggestively in NHWs. Positive associations with later first full\u2010term pregnancy (FTP), longer interval between menarche and first FTP and shorter time since last FTP were limited to younger Hispanics and Asian Americans. Except for nulliparity, reproductive characteristics were not associated with risk in African Americans. For HR\u2212 BC, lower risk was associated with later menarche, except in African Americans and older Asian Americans and with longer breast\u2010feeding in Hispanics and Asian Americans only. In younger African Americans, HR\u2212 BC risk associated with higher parity (\u22653 <jats:italic>vs<\/jats:italic>. 1 FTP) was increased fourfold in women who never breast\u2010fed, but not in those with a breast\u2010feeding history, suggesting that breast\u2010feeding may mitigate the adverse effect of higher parity in younger African American women. Further work needs to evaluate why menstrual and reproductive risk factors vary in importance according to age and ethnicity.<\/jats:p>","DOI":"10.1002\/ijc.32923","type":"journal-article","created":{"date-parts":[[2020,2,17]],"date-time":"2020-02-17T05:17:33Z","timestamp":1581916653000},"page":"1808-1822","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Menstrual and reproductive characteristics and breast cancer risk by hormone receptor status and ethnicity: The Breast Cancer Etiology in Minorities study"],"prefix":"10.1002","volume":"147","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3259-8003","authenticated-orcid":false,"given":"Esther M.","family":"John","sequence":"first","affiliation":[{"name":"Department of Epidemiology &amp; Population Health Stanford University School of Medicine  Stanford CA"},{"name":"Department of Medicine (Oncology) Stanford University School of Medicine  Stanford 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