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The difference of low attenuation area on CT images between patients with non-pneumonitis and pneumonitis
| Percentage of area under low attenuation area (mean ± SD) | All | Non-pneumonitis | Pneumonitis | p value |
| −860 HU (%) | 45.3 ± 22.3 | 62.3 ± 15.4 | 40.0 ± 21.5 | 0.0004 |
| −950 HU (%) | 9.1 ± 12.4 | 16.0 ± 16.2 | 6.9 ± 10.3 | 0.005 |
| Average HU (HU) | −845.6 ± 36.3 | −869.8 ± 16.0 | −838.2 ± 37.6 | 0.001 |
HU, Hounsfield unit, SD, standard deviation.
