Table 2.

CT features of the patients with COVID-19 at different stages

	Scan-1 (n = 22)	Scan-2 (n = 22)	Scan-3 (n = 22)	Scan-4 (n = 16)
The period between the onset of initial symptoms and the CT scan (days)	1.0 (1.25)	11.2 ± 4.9	18.3 ± 7.9	27.0 (12.5)
CT score	1.0 (1.0)	6.0 (12.0)	4.5 (11.0)	2.0 (5.0)
Number of affected lobes	1.0	2.5 (4.0)	2.5 (4.0)	1.0 (3.0)
0	0	0	1 (5%)	5 (31%)
1	22 (100%)	8 (36%)	8 (36%)	5 (31%)
2–4	0	6 (27%)	5 (23%)	3 (19%)
5	0	8 (36%)	8 (36%)	3 (19%)
Zones of involved lung
Left upper lobe	4 (18%)	12 (55%)	9 (41%)	2 (13%)
Left lower lobe	7 (32%)	18 (82%)	10 (45%)	4 (25%)
Right upper lobe	2 (9%)	9 (41%)	16 (73%)	9 (56%)
Right middle lobe	2 (9%)	10 (45%)	11 (50%)	5 (31%)
Right lower lobe	7 (32%)	16 (73%)	16 (73%)	8 (50%)
Maximum diameter of lesion*	25.1 ± 12.7
Predominant distribution of lesions
No lesion	0	0	1 (5%)	5 (31%)
Subpleural distribution	16 (73%)	9 (41%)	8 (36%)	6 (38%)
Central distribution	6 (27%)	5 (23%)	3 (14%)	1 (6%)
Both	0	8 (36%)	10 (45%)	4 (25%)
Ground-glass opacities
Yes	22 (100%)	22 (100%)	16 (73%)	9 (56%)
No	0	0	6 (27%)	7 (44%)
Crazy-paving pattern
Yes	8 (36%)	15 (68%)	0	0
No	14 (64%)	7 (32%)	22 (100%)	16 (100%)
Consolidation
Yes	9 (41%)	19 (86%)	15 (68%)	4 (25%)
No	13 (59%)	3 (14%)	7 (32%)	12 (75%)
Linear opacities
Yes	0	7 (32%)	10 (45%)	3 (19%)
No	22 (100%)	15 (68%)	12 (55%)	13 (81%)
Pleural effusion	0	5 (23%)	0	0

The categorical variables were expressed as count (percentage of the total). The continuous variables were expressed as mean ± SD or median (IQR)

*With the development of the disease, some lesions were fused and diffused, and the maximum diameter could not be obtained. Therefore, only the maximum diameter at the first CT scan was provided