Fig. 2.

Kaplan-Meier plots illustrating the effect of POR and of lidocaine therapy on postoperative survival. Kaplan-Meier plots of cumulative probability of survival and the log-rank test were used to compare survival between horses that developed or did not develop postoperative reflux (a), horses that received or did not receive lidocaine CRI intraoperatively (b). Following stratifying the data by postoperative reflux, the effect of postoperative lidocaine therapy was assessed in horses that developed (c) or did not develop postoperative reflux (d). The number of horses in each category and the log-rank test p values are shown