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. 2012 Dec 21;105(3):166–174. doi: 10.1093/jnci/djs505

Figure 1.

Figure 1.

Relative risk of breast cancer in parous women according to breastfeeding history and number of births. Estimates from reanalysis of 47 epidemiological studies (cohort and case–control) conducted in 30 different countries, with parity, lactation, and breast cancer status available for more than 122000 women. Risk estimates diverge based on breastfeeding status at four or more births. Women who ever breastfed and had four children (for a median duration of breastfeeding of 16 months) had a floating absolute risk of 0.73 (floating standard error [FSE] = 0.020), whereas women who had four children but never breastfed had a floating absolute risk of 0.84 (FSE = 0.038). At five births, floating absolute risk was 0.73 (FSE = 0.039) for parous women who did not breastfeed and 0.64 (FSE = 0.020) for women who breastfed a median duration of 30 months. *Relative risk was calculated as floating absolute risk and stratified by study, age, age at first birth, and menopausal status. FCI = floating confidence interval. Permission for reproduction from (8).