All other potential confounders were evenly distributed throughout all other age groups. Age at first childbirth in relation to risk of death after breast cancer diagnosis Nulliparous women had a poorer breast cancer specific survival as compared to women who were < 20 years of age at AFB, however, these results did not reach statistical significance (Table 2 ).
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Age at first childbirth and breast cancer survival: a prospective cohort study.
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