Table 1. Study cohort descriptive statistics.
COPD: chronic obstructive pulmonary disease, TIA: transient ischemic attack, GCS: Glasgow Coma Scale, BP: blood pressure, MAP: mean arterial pressure, SpO2: peripheral oxygen saturation, ABG: arterial blood gas, Δ (A-a): O2 alveolar-arterial oxygen gradient
| Variable | All patients (n = 101) | Variable | All patients (n = 101) | |
| Age, years, mean ± SD | 73.2 ± 15.9 | Fatigue | 11 (10.9) | |
| Gender, n (%) | Myalgias or arthralgias | 10 (9.9) | ||
| Male | 54 (53.5) | Diarrhea | 7 (6.9) | |
| Female | 47 (46.5) | Dysosmia/Dysgeusia | 2 (2) | |
| Comorbidities, n (%) | GCS < 15 | 21 (20.8) | ||
| Hypertension | 59 (58.4) | Vital signs, mean ± SD | ||
| Diabetes mellitus | 13 (11.9) | Systolic BP, mmHg | 121.5 ± 19.3 | |
| Smoking | 8 (7.9) | Diastolic BP, mmHg | 71.1 ± 11.6 | |
| COPD | 25 (24.8) | MAP, mmHg | 87.9 ± 12.6 | |
| Asthma | 3 (3) | Heart rate, beats/min | 88 ± 17.7 | |
| Other respiratory diseases | 8 (7.9) | Respiratory rate, breaths/min | 23.6 ± 7 | |
| Ischemic heart disease (IHD) | 15 (14.9) | SpO2, % | 92.5 ± 4.8 | |
| Oncologic condition | 8 (7.9) | Body temperature, °C | 37.5 ± 0.9 | |
| Chronic kidney disease (CKD) | 11 (10.9) | ABG analysis, mean ± SD | ||
| History of stroke or TIA | 12 (11.9) | pH | 7.5 ± 0.1 | |
| Immunodeficiency | 2 (2) | PaCO2, mmHg | 32 ± 6 | |
| Clinical features, n (%) | PaO2, mmHg | 56.9 ± 10.2 | ||
| Fever | 93 (92.1) | HCO3-, mmol/L | 23.6 ± 3.3 | |
| Shortness of breath (SOB) | 63 (62.4) | Lactate, mmol/L | 1.3 ± 0.6 | |
| Cough | 51 (50.5) | P/F ratio | 267.6 ± 50 | |
| Sore throat | 3 (3) | Δ (A-a) O2 | 53.5 ± 11.9 | |
| Headache | 2 (2) | ROX index | 20.3 ± 7.1 |