Fig. 1. Kaplan-Meier recurrence-free survival estimates for 123 patients given general anesthesia and postoperative opioids (general–opioid) and for 102 patients given general anesthesia combined with epidural analgesia (epidural–general) during radical prostatectomy for prostate cancer; univariable  P < 0.001.  Vertical tick marks represent censored values.  Light dashed lines show 95% confidence intervals for the epidural–general group;  light solid lines show 95% confidence intervals for the general–opioid group.