Table 1. Baseline characteristics of the patient population.
| No. of subjects | 66 |
| Age, mean (SD), y | 58.7 (8.7) |
| Sex | |
| Male, no (%) | 54 (82) |
| Female, no (%) | 12 (18) |
| SAPS II*, median (IQR) | 45 (43–50) |
| Thorax CT Score*, median (IQR) | 50 (40–65) |
| PaO2/FiO2*, mean (SD) | 97.9 (47.1) |
| Duration of IMV, mean (SD), days | 21.4 (7.2) |
| ICU LOS, mean (SD), days | 23.2 (6.9) |
| Outcome ICU** | |
| Alive, no (%) | 57 (86.4) |
| Dead, no (%) | 9 (13.6) |
| 18 in ICU | |
Abbreviations: No. = number, SD = standard deviation, y = years, SAPS = Simplified Acute Physiology Score, IQR = interquartile range, CT = computed tomography, PaO2 = arterial partial pressure of oxygen, FiO2 = fraction of inspired oxygen, IMV = invasive mechanical ventilation, ICU = intensive care unit, LOS = length of stay.
* = at ICU admission.
** = at ICU discharge.