Multivariate logistic regression analysis revealed four predictors of mortality: (1) age > 75 years (OR: 10.8; 95% CI: 2.1 to 54.5), (2) mechanical ventilation at admission (OR: 38.8; 95% CI: 3.4 to 442.4), (3) septic shock at admission (OR: 9.5; 95% CI: 1.4 to 64.9), (4) development of any complication during hospitalization (OR: 742.4; 95% CI: 88.4 to 6232.9).