Fig. 3.

Abnormal chest computed tomography findings during the first visit in COVID-19 patients of different severity groups. Data of abnormal CT findings are presented as mean percentages ± standard errors (error bars) in the total patients and the three groups. ANOVA was used to compare the scores between the three groups, and Holm correction was used to test for multiple comparisons. Mild to moderate group, no need for oxygen supplementation; severe group, need for oxygen supplementation with no ventilation assistance; critical group, need for ventilation assistance. (ANOVA, analysis of variance; CT, computed tomography; GGO, ground glass opacity).