Table 4. Demographics and Clinical Characteristics of Patients in Validation Cohorts.
| Characteristic | No./No. (%) | ||
|---|---|---|---|
| Validation cohort, total | Critical illness | ||
| No | Yes | ||
| No. | 729 | 642 | 87 |
| Age, mean (SD) [range], y | 48.2 (15.2) [4-88] | 46.2 (14.3) | 63.1 (13.1) |
| Neutrophil-lymphocyte ratio | 5.8 (8.7) [0.08-109.2] | 4.3 (3.8) | 17.1 (20.0) |
| Lactate dehydrogenase, mean (SD) [range], U/L | 288.3 (151.2) [106-1390] | 264.1 (119.6) | 479.5 (223.8) |
| Direct bilirubin, mean (SD) [range], umol/L | 9.7 (9.6) [0-79] | 9.1 (9.5) | 14.1 (9.8) |
| Abnormal chest radiograph | 355/723 (49.1) | 277/639 (43.3) | 78/84 (92.9) |
| Hemoptysis | 8/724 (1.1) | 7/642 (1.0) | 1/82 (1.2) |
| Shortness of breath | 118/724 (16.3) | 70/642 (10.9) | 48/82 (58.5) |
| Unconsciousness | 6/724 (0.8) | 0/642 (0) | 6/82 (0.7) |
| Comorbidities | |||
| 0 | 550/722 (76.2) | 521/642 (81.2) | 29/80 (36.3) |
| 1 | 103/722 (14.3) | 83/642 (12.9) | 20/80 (25.0) |
| 2 | 56/722 (7.8) | 33/642 (5.1) | 23/80 (28.8) |
| 3 | 10/722 (1.4) | 3/642 (0.4) | 7/80 (8.8) |
| 4 | 3/722 (0.4) | 2/642 (0.3) | 1/80 (1.3) |
| Malignant disease | 9/723 (1.2) | 9/642 (1.4) | 0/81 (0) |