Age at first birth, parity and risk of breast cancer in a Swedish population.

In the different parity groups a risk significantly lower than that for nulliparous women was found only for women with more than 2 children (SRR = 0.59) but the trend with parity was highly significant (P less than 0.001).

also in 132,142 other papers

This inference is u u u further supported by the data in Table VI. When women with their first birth before the age of 20 years were used as a refer- ence, no SRR for the subgroups with higher ages at first birth differed signifi- 30 35 40 cantly from unity. 30 35 40 On subdivision into age groups (Table FIRST BIRTH V), a significant trend with age at first )f breast cancer at birth was found only for women of less rth, relative to a risk than 40 years. swomen.

also in 9,775 other papers