Figure 2

ROC curve for POSSUM, P-POSSUM and E-PASS scores predicting in-hospital mortality in surgical treatment of hilar cholangiocarcinoma. ROC curve: receiver operating characteristic curve; POSSUM: Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity; P-POSSUM: Portsmouth modification of POSSUM; E-PASS: Estimation of physiologic ability and surgical stress.