Multivariate stepwise Cox regression analysis
| p-value | HR (95% CI) | |
| ACE | ||
| II | 1# | |
| ID | 0.008 | 5.2 (1.5–17.6) |
| DD | 0.005 | 5.7 (1.7–19.2) |
| SAPS | 0.001 | 1.04 (1.02–1.07) |
| Pa,O2/FI,O2 | 0.013 | 0.99 (0.98–0.99) |
| BMI | 0.022 | 0.86 (0.75–0.98) |
| PEEP | 0.010 | 0.87 (0.78–0.97) |
HR: hazard ratio; CI: confidence interval; ACE: angiotensin-converting enzyme; I: insertion; D: deletion; SAPS: Simplified Acute Physiology Score; Pa,O2: arterial oxygen tension; FI,O2: inspiratory oxygen fraction; BMI: body mass index; PEEP: positive end-expiratory pressure. #: reference.