Table 1 Characteristics of the patients at baseline
Characteristic | Total (n = 104) | Survivors (n = 50) | Non-survivors (n = 54) | p value |
|---|---|---|---|---|
Age, years | 60.00 [51.00, 72.25] | 60.00 [49.00, 72.00] | 62.50 [53.25, 72.75] | 0.376 |
Gender, male | 79 (76.0) | 38 (76.0) | 41 (75.9) |  > 0.999 |
Bacterial infection | 60 (57.7) | 32 (64) | 28 (51.9) | 0.238 |
APACHE II score (mean (SD)) | 21.88 (7.15) | 21.98 (7.50) | 21.80 (6.89) | 0.897 |
SOFA score | 9.00 [7.00, 11.00] | 9.00 [6.25, 11.00] | 8.00 [7.00, 11.00] | 0.541 |
RASS (mean (SD)) | -3.83 (0.53) | -3.80 (0.61) | -3.85 (0.45) | 0.62 |
Neuromuscular blockade | 67 (64.4) | 31 (62.0) | 36 (66.7) | 0.684 |
Time from admission to ICU to the first PP | 1.00 [0.00, 3.00] | 1.00 [0.00, 3.00] | 1.00 [0.00, 2.00] | 0.962 |
Comorbidities | ||||
 Septic shock | 65 (62.5) | 26 (52.0) | 39 (72.2) | 0.043 |
 Immunocompromised | 54 (51.9) | 17 (34.0) | 37 (68.5) | 0.001 |
 Barotrauma | 12 (11.5) | 5 (10.0) | 7 (13.0) | 0.763 |
 Severe pneumonia | 101 (97.1) | 47 (94) | 54 (100) | 0.108 |
 COVID-19 | 23 (22.1) | 11 (22.0) | 12 (22.2) |  > 0.999 |
Pre-prone ventilation parameters | ||||
 FiO2 | 0.90 [0.70, 1.00] | 0.90 [0.70, 1.00] | 0.98 [0.71, 1.00] | 0.444 |
Pre-prone blood gases | ||||
 pH | 7.37 [7.32, 7.42] | 7.37 [7.29, 7.42] | 7.38 [7.34, 7.43] | 0.177 |
 PaCO2, mm Hg | 41.45 [36.50, 50.17] | 42.85 [37.33, 53.63] | 39.90 [35.65, 47.72] | 0.161 |
 PaO2, mm Hg | 79.85 [66.00, 102.00] | 83.65 [66.12, 103.75] | 77.50 [66.32, 100.12] | 0.711 |
 P/F ratio, mm Hg | 93.93 [73.85, 141.75] | 97.83 [83.48, 142.25] | 89.67 [71.03, 136.92] | 0.347 |