Cumulative incidence of subsequent bilateral oophorectomy (A), hysterectomy (B), and the competing risks (C) of which procedure occurs first in women with primary infertility compared to age-matched referent women, using age as the time scale. A. Case vs referent: hazard ratio (HR) 1.81, 95% CI 1.36–2.42. B. Case vs referent: HR 1.08, 95% CI 0.88–1.32. C. Concurrent hysterectomy with bilateral oophorectomy; case vs referent HR 1.73, 95% CI 1.27–2.37. Hysterectomy with ovarian conservation; case vs referent HR 0.73, 95% CI 0.55–0.96.