Table 4.
Changes in CT features, lung lobes involved, and lesion distribution during the different stages
| CT features | Stage 1 (0–3 days, n = 155) |
Stage 2 (4–7 days, n = 155) |
Stage 3 (8–14 days and later, n = 155) |
|---|---|---|---|
| Main signs | |||
| GGO | 98 (63.2%) | 50 (32.3%) | 70 (45.2%) |
| Consolidation | 3 (1.9%) | 109 (70.3%) | 122 (78.7%) |
| Crazy paving patterns | 10 (6.5%) | 50 (32.3%) | 94 (60.6%) |
| Fibrotic lesions | 3 (1.9%) | 35 (22.6%) | 98 (63.2%) |
| Secondary signs | |||
| Air bronchogram signs | 10 (6.5%) | 43 (27.7%) | 81 (52.3%) |
| Small-vessel thickening | 90 (58.1%) | 70 (45.2%) | 83 (53.5%) |
| Pleural effusion | 3 (1.9%) | 3 (1.9%) | 3 (1.9%) |
| Number of lobes involved | |||
| 0 | 20 (12.9%) | 8 (5.2%) | 5 (3.2%) |
| 1 | 8 (5.2%) | 5 (3.2%) | 5 (3.2%) |
| 2 | 17 (11.0%) | 12 (7.7%) | 6 (3.9%) |
| 3 | 28 (18.1%) | 30 (19.4%) | 18 (11.6%) |
| 4 | 39 (25.2%) | 42 (27.1%) | 58 (37.4%) |
| 5 | 43 (27.7%) | 58 (37.4%) | 63 (40.6%) |
| Distribution of abnormalities | |||
| Sub-pleural areas | 135 (87.1%) | 120 (77.4%) | 116 (74.8%) |
| Sub-pleural and central areas | 0 | 27 (17.4%) | 34 (21.9%) |
| Central areas | 0 | 0 | 0 |