Figure. Association Between Breastfeeding and Epithelial Ovarian Cancer in 13 Case-Control Studies.

Summary odds ratios (ORs) and 95% CIs for the association between ever breastfeeding and risk of invasive ovarian cancer (A) or borderline tumors (B) estimated by random-effects meta-analysis of 13 studies from the Ovarian Cancer Association Consortium (1989-2009) adjusted for age, race/ethnicity, oral contraceptive use, parity, and birth decade. AUS indicates Australian Ovarian Cancer Study³⁷; CON, Connecticut Ovarian Cancer Study³⁸; DOV, Diseases of the Ovary and their Evaluation⁴⁰; GER, German Ovarian Cancer Study⁴¹; HAW, Hawaii Ovarian Cancer Case-Control Study³⁴; HOP, Hormones and Ovarian Cancer Prediction Study³⁵; MAL, Malignant Ovarian Cancer Study³³; NCO, North Carolina Ovarian Cancer Study⁴⁴; NEC, New England Case Control Study⁴²; NJO, New Jersey Ovarian Cancer Study³²; SON, Southern Ontario Ovarian Cancer Study³⁹; STA, Family Registry for Ovarian Cancer and Genetic Epidemiology of Ovarian Cancer³⁶; USC, University of Southern California Study of Lifestyle and Women’s Health.⁴³