Table 1. Characteristics of the study population.
| Characteristics | N (%) or Mean (SD) |
|---|---|
| Age, yr | 73 (13) |
| Female sex | 57 (41) |
| Body mass index | 21.2 (4.5) |
| Reason of ventilator use | |
| Medical | 120 (87) |
| Postoperative | 18 (13) |
| SAPS II score at ventilator start | 59 (15) |
| SAPS II score at the 1st SBT | 46 (14) |
| PaO2/FiO2 ratio at ventilator initiation | 263 (119) |
| Hemoglobin level, g/dL | |
| Ventilator start | 10.7 (2.2) |
| Ventilator day 30 | 9.5 (1.4) |
| White blood cell count, 109 cells/L | 13.9 (7.1) |
| Platelet count, 109/L | 218 (107) |
| Creatinine level, mg/dL | 1.7 (1.4) |
| Transfusion with red blood cells | 97 (70) |
| Comorbidity | |
| Renal insufficiency, CCR<30 mL/min | 52 (38) |
| Diabetes | 45 (33) |
| Gastrointestinal bleeding | 28 (20) |
| Malignancy | 25 (18) |
| Coronary arterial disease | 19 (14) |
| COPD | 15 (11) |
CCR = creatinine clearance rate; SBT = spontaneous breathing trial
N=138