Maternal age and birth rank of women with breast cancer.
Data from a large international case-control study of breast cancer suggested that women born to young mothers had a 25% lower risk of breast cancer. The association was not secondary to a tendency for these women themselves to have had children at early ages. The data provided no indication of a meaningful association between breast cancer risk and birth rank. Confounding was controlled by stratification according to a summary confounder score.
D000328:Adult; D001722:Birth Order; D001943:Breast Neoplasms / Q000209:etiology*; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008423:Maternal Age; D012306:Risk