Table 1. Comparison of demographic data, comorbidities, clinical symptoms, and blood gas analysis parameters among different risk stratifications.
| Characteristics | Low-risk and intermediate-low-risk (n=196) | Intermediate-high-risk and high-risk (n=31) | P |
|---|---|---|---|
| Demographic characteristics | |||
| Gender | 0.16 | ||
| Male | 96 (49.0) | 11 (35.5) | |
| Female | 100 (51.0) | 20 (64.5) | |
| Age, years | 68 (61, 76) | 72 (64, 76) | 0.28 |
| Comorbidities | |||
| Hypertension | 88 (44.9) | 12 (38.7) | 0.52 |
| Diabetes | 38 (19.4) | 5 (16.1) | 0.67 |
| Cancer | 39 (19.9) | 4 (12.9) | 0.36 |
| Rheumatic immune system diseases | 14 (7.1) | 3 (9.7) | 0.62 |
| Chronic pulmonary diseases | 29 (14.8) | 2 (6.5) | 0.21 |
| Chronic heart failure/atrial fibrillation | 12 (6.1) | 2 (6.5) | 0.94 |
| Recent surgery | 26 (13.3) | 5 (16.1) | 0.67 |
| Thrombophilia | 12 (6.1) | 3 (9.7) | 0.46 |
| Deep vein thrombosis | 156 (79.6) | 23 (74.2) | 0.47 |
| Symptoms | |||
| Cough | 66 (33.7) | 7 (22.6) | 0.22 |
| Expectoration | 52 (26.5) | 6 (19.4) | 0.40 |
| Chest pain | 52 (26.5) | 9 (29.0) | 0.77 |
| Dyspnea | 115 (58.7) | 27 (87.1) | 0.002 |
| Hemoptysis | 21 (10.7) | 2 (6.5) | 0.47 |
| Syncope | 15 (7.7) | 7 (22.6) | 0.009 |
| Palpitations | 21 (10.7) | 4 (12.9) | 0.72 |
| Fever | 29 (14.8) | 0 (0.0) | 0.03 |
| Blood gas analysis indicators | |||
| P/F ratio | 311.6 (267.7, 375.4) | 227 (185.5, 270) | <0.001 |
| PaCO2 | 37.5 (34.9, 41.7) | 37.4 (32.5, 39.0) | <0.001 |
| SpO2/FiO2 | 404 (295.2, 457) | 278.0 (232, 352) | 0.002 |
Data are presented as n (%) or median (interquartile range). P/F, partial oxygen pressure/fraction of inspired oxygen; PaCO2, partial pressure of carbon dioxide; SpO2/FiO2, pulse oxygen saturation/fraction of inspired oxygen.