Table 1.

The general information of selected patients.

Group	Average age (weeks)	Gender (male/female)	Disease duration (month)	Injury part
				Arterial narrowing	Arteriosclerosis
Control	29.6 ± 4.1	27/53	0.83 ± 0.12	44	36
Observation	29.6 ± 4.1	24/56	0.76 ± 0.07	47	33
t	—	1.713	0.699	1.723	1.635
P	—	0.089	0.679	0.078	0.098