Table 2.
Comparison of the parameters between the survivors and non-survivors in the study
| Variables | Survivors (n = 22) | Non-survivors (n = 30) | p-value |
|---|---|---|---|
| Age (years) | 43.73 ± 14.13 | 46.33 ± 13.70 | 0.507* |
| APACHE II score | 14.86 ± 5.76 | 16.50 ± 5.13 | 0.263* |
| Duration of PPV (hours) | 32 (16–32) | 18 (18–32) | 0.400** |
| SOFA score | 6.86 ± 2.71 | 10.43 ± 4.00 | <0.001* |
| LIS | 2.71 ± 0.45 | 3.09 ± 0.59 | 0.008* |
| DP pre-PPV, (cmH2O) | 16.36 ± 2.57 | 19.43 ± 3.16 | <0.001* |
| DP during PPV, (cmH2O) | 14.36 ± 1.96 | 19.57 ± 2.87 | <0.001* |
| DP post-PPV, (cmH2O) | 13.91 ± 1.74 | 19.70 ± 3.15 | <0.001* |
| PaO2/FiO2 pre-PPV | 92.75 (67.5–117.75) | 87.90 (67.75–100.75) | 0.511** |
| PaO2/FiO2 during PPV | 122 (162.50–218.50) | 104.75 (163.75) | 0.028** |
| PaO2/FiO2 post-PPV | 205.50 (116.25–244.50) | 112 (88.0–146.50) | 0.003** |
| LOS (ICU) (days) | 11 (7–20) | 8 (4–11) | 0.009** |
| ARDS pulmonary cause | 13 (44.8%) | 16 (55.2%) | 0.781# |
*Independent Student t-test; **Mann–Whitney U-test; #Chi-square test; APACHE II score, acute physiology and chronic health evaluation II score; ARDS, acute respiratory distress syndrome; DP, driving pressure; LIS, Murray lung injury score; PPV, prone position ventilation; PaO2/FiO2, ratio of partial pressure of arterial oxygen to fraction of inspired oxygen; SOFA, sequential organ failure assessment