Fig. 2From: Association of pelvic inflammatory disease (PID) with ovarian cancer: a nationwide population-based retrospective cohort study from TaiwanUsing Aalen-Johansen survival statistics, it showed crude overall survival curves by with and without pelvic inflammatory disease. Over follow-up, the cumulative incidence of ovarian cancer was significantly higher in the PID cohort than among controls. (log-rank P < 0.0001)Back to article page