Table 3.

Chest CT variation after symptoms onset measured by CT score in patients of 2021

Grouping	Total CT times	0–3 days		4–7 days		More than 8 days
		n	$\overline{x}$ ± SD	n	$\overline{x}$ ± SD	n	$\overline{x}$ ± SD
A	143	49	0.98 ± 1.43	39	1.67 ± 2.29	55	1.09 ± 1.69	NS
B	92	23	1.69 ± 0.82	25	2.88 ± 2.45	44	1.21 ± 1.39	*
C	51	24	0	13	0.86 ± 0.62	14	0.25 ± 1.17	NS

A all children, B children with abnormal CT in first time, C children with normal CT in first time, NS not significant. *There was a significant difference between the 0–3 day group and the 4–7 day group (P = 0.039); the 4–7 day group and the group over 8 days had a significant difference (P < 0.001)