Fig. 3From: Perioperative mortality rate and its predictors after emergency laparatomy at Debre Markos comprehensive specialized hospital, Northwest Ethiopia: 2023: retrospective follow-up studyKaplan Meier curves related to need for preoperative vasopressors, January 1, 2019, to December 31, 2022 (N = 386) Test of assumptions of Cox proportional hazards testBack to article page