Baseline characteristics of the patients with COVID-19 ARDS who received CPAP and attempted conscious PP (n=24)
| Characteristics | Value |
| Age, years | 62 (13) |
| Male sex, n (%) | 15 (63) |
| Coexisting conditions, n (%) | |
| Diabetes | 7 (29) |
| Hypertension | 13 (54) |
| Renal failure | 2 (8) |
| COPD | 0 (0) |
| Heart failure | 1 (4) |
| Cancer | 2 (8) |
| Immunodeficiency, n (%) | 2 (8) |
| APACHE II score | 11 (5)* |
| CFS | 2 (1–3) |
| ROX index prior to CPAP | 6.8 (2.5) |
| PaO2:FiO2 prior to CPAP, mm Hg | 112 (106–194) |
| ARDS severity classification, n (%) | |
| <100 (severe) | 5 (21) |
| 100–200 (moderate) | 14 (58) |
| 200–300 (mild) | 3 (13) |
| >300 | 2 (8) |
| Murray Lung Injury Score | 2.7 (2.7–3.0) |
| Maximum PEEP required, cmH2O | 12 (12–15) |
| Maximum FiO2 required | 0.60 (0.50–0.70) |
Data are shown as number (%) for categorical variables and mean (SD) or median (IQR).
*Insufficient data meant the APACHE II score could not be calculated in six patients.
APACHE, Acute Physiology and Chronic Health Evaluation; ARDS, acute respiratory distress syndrome; CFS, Clinical Frailty Score; COPD, chronic obstructive pulmonary disease; CPAP, continuous positive airway pressure; FiO2, fractional inspired oxygen; PaO2, arterial oxygen pressure; PEEP, positive end-expiratory pressure; PP, prone positioning.