Table 3. Baseline CT features of patients with COVID-19.
| Parameter | All patients (n=196) | Severe group (n=45) | Non–severe group (n=151) | P values |
|---|---|---|---|---|
| No. of pulmonary segments involved | 10 [4–15] | 15 [12–18] | 7 (3–13.5) | <0.001* |
| Distribution | ||||
| Bilateral lung | 164 (83.7) | 43 (95.6) | 121 (80.1) | 0.012* |
| Inferior lobes preference | 121 (61.7) | 28 (62.2) | 93 (61.6) | 1.000 |
| Peripheral preference | 173 (88.3) | 38 (84.4) | 135 (89.4) | 0.428 |
| Types of pulmonary opacities | ||||
| Type I | 83 (42.3) | 18 (40.0) | 65 (43.0) | 0.735 |
| Type II | 139 (70.9) | 32 (71.1) | 107 (70.9) | 1.000 |
| Type III | 140 (71.4) | 37 (82.2) | 103 (68.2) | 0.090 |
| Type IV | 50 (25.5) | 15 (33.3) | 35 (23.2) | 0.178 |
| Internal signs | ||||
| Air bronchograms | 144 (73.5) | 39 (86.7) | 105 (69.5) | 0.022* |
| Other signs | ||||
| Focal pulmonary fibrosis | 69 (35.2) | 17 (37.8) | 52 (34.4) | 0.724 |
| Pleural effusion | 9 (4.6) | 5 (11.1) | 4 (2.6) | 0.031* |
| Mediastinal lymphadenopathy | 3 (1.5) | 2 (4.4) | 1 (0.7) | 0.132 |
| Quantitative CT parameters | ||||
| POICT, % | 3.1 (1.0–8.2) | 11.1 (5.3–22.7) | 2.3 (0.8–4.8) | <0.001* |
| MOICT, mg | 64,803.5 (23,153.5–164,271.0) | 257,052.0 (113,596.0–456,735.0) | 52,535.4 (19,200.5–106,885.5) | <0.001* |
| Percentage of consolidation, % | 29.8 (18.0–40.6) | 32.9 (23.4–41.7) | 28.9 (16.5–40.1) | 0.152 |
Continuous variables are presented as median (interquartile range), and dichotomous variables are presented as numbers of patients, with percentages in parentheses. *, P<0.05. P values are from Fisher’s exact test or Wilcoxon rank-sum test when comparing the severe group with the non-severe group; COVID-19, coronavirus disease 2019; CT, computed tomography; POICT, the percentage of infection in the whole lung; MOICT, the mass of infection in the whole lung.