Meta-analysis of the overall associationa between frequent aspirin use and ovarian cancer risk in OC3 and OCAC. aAdjusted for age, parity, duration of oral contraceptive use, duration of menopausal hormone therapy use, and BMI. AARP, NIH-AARP Diet and Health Study; AUS, Australian Ovarian Cancer Study & Australian Cancer Study; BMI, body mass index; CPS2, Cancer Prevention Study II Nutrition Cohort; CTS, California Teachers Study, DOV, Diseases of the Ovary and their Evaluation Study; HAW, Hawaii Ovarian Cancer Study; HOP, Hormones and Ovarian Cancer Prediction Study; IWHS, Iowa Women's Health Study; NCO, North Carolina Ovarian Cancer Study; NHS, Nurses' Health Study; NHSII, Nurses' Health Study II; OC3, Ovarian Cancer Cohort Consortium; OCAC, Ovarian Cancer Association Consortium; PLCO, Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial; RR, relative risk; SISTERS, Sister Study; UCI, University of California, Irvine Ovarian Cancer Study; UKO, United Kingdom Ovarian Cancer Population Study; USC, University of Southern California, Study of Lifestyle and Women’s Health; VITAL, Vitamins and Lifestyle Cohort.