Table 5.
Comparison of CT features between asymptomatic patients with CT findings who never developed symptoms and those who went on to develop symptoms 1–5 days after the original CT scan
| Patients with CT infiltrates and no clinical symptoms (n = 24) | Patients with CT infiltrates and symptoms appeared later (n = 24) | p value | |||
| Avg | SD | Avg | SD | ||
| Lung volume | |||||
| Whole lung volume (cm3) | 4231 | 1067 | 4235 | 1239 | 0.798 |
| Healthy lung volume (cm3) | 4156 | 1092 | 4097 | 1264 | 0.976 |
| Infiltrate volume (cm3) | 76 | 103 | 146 | 171 | 0.014* |
| Percent lung involvement (%) | 2.0 | 2.7 | 3.7 | 4.5 | 0.013* |
| Lung attenuation | |||||
| Whole lung attenuation (HU) | - 805 | 182 | - 817 | 47 | 0.030* |
| Healthy lung attenuation (HU) | - 846 | 30 | - 825 | 47 | 0.089 |
| Infiltrate attenuation (HU) | - 633 | 84 | - 587 | 99 | 0.085 |
| Localization | Number | % | Number | % | |
| Bilateral | 12 | 50 | 16 | 67 | 0.277 |
| Left | 6 | 25 | 6 | 25 | |
| Right | 6 | 25 | 2 | 8 | |
| Peripheral | 24 | 100 | 23 | 96 | 1.000 |
| Central | 0 | 0 | 1 | 4 | |
| Main lobe | |||||
| Diffuse | 8 | 33 | 15 | 63 | 0.120 |
| Inferior | 11 | 46 | 6 | 25 | |
| Superior | 5 | 21 | 2 | 8 | |
| Infiltrate type | |||||
| Consolidation | 7 | 29 | 15 | 63 | 0.043* |
| Ground glass opacity | 23 | 96 | 22 | 92 | 1.000 |
| Crazy paving | 10 | 42 | 3 | 13 | 0.051 |
| Preexisting lung disease | 5 | 21 | 1 | 4 | 0.190 |
| Avg | SD | Avg | SD | ||
| Number of infiltrates | 3.4 | 2.9 | 4.4 | 3.0 | 0.288 |
Abbreviations: Avg, average; SD, standard deviation; HU, Hounsfield unit
*p < 0.05