Multivariate regression analysis, dependent variable: hospital mortality
| Variable | OR | 95% CI | P value |
| Internal medicine patient | 3.392 | 1.098 to 10.474 | 0.034 |
| RRT on WEA | 2.224 | 0.750 to 6.594 | 0.150 |
| Need for vasopressors on WEA | 1.972 | 1.327 to 2.932 | <0.001 |
| SAPS II+TISS at admission on WEA | 1.057 | 0.988 to 1.132 | 0.108 |
| Age | 1.049 | 0.994 to 1.108 | 0.084 |
| Duration of MV | 1.001 | 1.000 to 1.002 | 0.067 |
| Hb value at admission on ICU | 0.807 | 0.654 to 0.995 | 0.044 |
Hb, haemoglobin; ICU, intensive care unit; MV, mechanical ventilation; RRT, renal replacement therapy; SAPS II, Simplified Acute Physiology Score II; TISS, Therapeutic Intervention Scoring System; WEA, weaning unit.