Table 3. Pulmonary ventilation and oxygen content of COVID-19 patients in severe or non-severe groups.
| All patients (n=113) | Non-severe patients (n=60) | Severe patients (n=53) | P value | |
| Oxygenation | ||||
| Nasal tube | 91 (80.5%) | 39 (65.0%0 | 52 (98.1%) | < 0.001 |
| Facial mask | 49 (43.4%) | 3 (5.0%) | 46 (86.8%) | < 0.001 |
| HFNC | 34 (30.1%) | 2 (3.3%) | 32 (60.4%) | < 0.001 |
| NIV | 18 (15.9%) | 0 (0.0%) | 18 (34.0%) | < 0.001 |
| IMV | 14 (12.4%) | 0 (0.0%) | 14 (26.4%) | < 0.001 |
| ECMO | 2 (1.8%) | 0 (0.0%) | 2 (3.8%) | 0.218 |
| Arterial blood gas analysis | ||||
| PH | 7.41±0.08 | 7.41±0.07 | 7.41±0.08 | 0.899 |
| PO2, mmHg | 77.74±33.91 | 87.56±28.09 | 75.53±35.02 | 0.342 |
| PCO2, mmHg | 40.18±9.63 | 42.22±7.31 | 39.73±10.10 | 0.488 |
| BE, mmol/L | 2.43±4.22 | 2.43±3.80 | 2.43±4.36 | 0.998 |
| CHCO3-st, mmol/L | 25.46±4.04 | 26.76±2.98 | 25.16±4.22 | 0.290 |
| FiO2, | 0.41±0.21 | 0.24±0.04 | 0.46±0.21 | < 0.001 |
| PaO2/FiO2, mmHg | 236.28±142.07 | 385.70±155.85 | 202.67±116.39 | < 0.001 |
Data are median (IQR), mean±SEM, n (%), or n/N (%). p values were calculated by Mann-Whitney U test, t test, χ2 test, or Fisher's exact test, as appropriate. HFNC, high-flow nasal catheter; NIV, non-invasive ventilation; IMV, invasive mechanical ventilation; ECMO, Extracorporeal Membrane Oxygenation.