Fig. 2From: Prior oral contraceptive use in ovarian cancer patients: assessing associations with overall and progression-free survivalProgression-Free Survival Based on Ever- (solid line) and Never-Users (dashed line) of Oral Contraceptives. In univariate analyses ever-users of oral contraceptives (n = 700) manifested a longer progression-free survival compared to never-users (dashed line) (n = 489) (HR = 0.71 (95 % CI: 0.61, 0.83); p < 0.0001 (accounting for left truncation). Within the cohort were a total of 656 events of cancer progression. Similar statistically significant findings were seen in univariate analyses when patients were dichotomized on the basis of duration of oral contraceptive useBack to article page