Fig. 2. Kaplan-Meier survival curves of no pressure ulcer group (straight line, n = 86) and pressure ulcer group (dotted line, n = 43) postoperative pressure ulcer. Patient in the pressure ulcer group had a significantly lower survival rate (90-day predictive mortality rate, 33.6% vs. 4.7%; 1-year predictive mortality rate, 40.3% vs. 8.6%; both P < 0.001).