Fig. 2.

Lung involvement increased in patients with low PaO₂ and correlated with a longer hospitalization period. Patients were subdivided into two groups according to the median PaO2 value. Caliper ILD and VRS percentages were obtained using CALIPER software for CT analysis and were expressed as percentages. ILD (A) and VRS (B) CALIPER parameters and days of hospitalization (C) in patients with lower and higher PaO₂ than 67 mmHg, respectively. Data are reported as mean ± SD. Differences between groups were evaluated by an un-parametric test (Mann-Withney test): ∗∗∗ p < 0.001 vs. PaO₂ ≥ 67. GraphPad Prism 8 was used to create the figure.