Table 1.
Baseline demographic and clinical characteristics of analysable population
| Analysable population (n=56) | ||
|---|---|---|
| Age, years | 57·4 (7·4) | |
| Sex | ||
| Female | 12 (21%) | |
| Male | 44 (79%) | |
| BMI, kg/m2 | 27·5 (3·7) | |
| Time between symptom onset and admission to hospital, days | 7·8 (4·2) | |
| Time between admission to hospital and prone positioning, days | 3·5 (3·1) | |
| Comorbidities | ||
| Previous myocardial infarction | 4 (7%) | |
| Congestive heart failure | 0 | |
| Hypertension | 23 (41%) | |
| Vascular disease | 3 (5%) | |
| Chronic bronchopulmonary disease | 2 (4%) | |
| Gastric or liver disease | 3 (5%) | |
| Diabetes | 8 (14%) | |
| Moderate-to-severe chronic kidney disease (eGFR <59 mL/min) | 0 | |
| Solid malignancy | 3 (5%) | |
| Smoking history | ||
| Active smoker | 1 (2%) | |
| Former smoker (<1 year) | 1 (2%) | |
| Former smoker (≥1 year) | 20 (36%) | |
| Never smoked | 29 (52%) | |
| Not declared | 5 (9%) | |
| Oxygen delivery interface | ||
| Helmet CPAP | 44 (79%) | |
| Reservoir mask | 9 (16%) | |
| Venturi mask | 3 (5%) | |
Data are n (%) or mean (SD). BMI=body-mass index. CPAP=continuous positive airway pressure. eGFR=estimated glomerular filtration rate.