Research on Association of the Diameter of the Internal Carotid Artery Siphon and Nonarteritic Anterior Ischaemic Optic Neuropathy

Table 3

Different gradings of ipsilateral ICA stenosis.

	Mild stenosis, n (%)	Moderate stenosis, n (%)	Severe stenosis, n (%)
Observation group	8 (26.67%)	3 (10.00%)	1 (3.33%)
Control group	7 (23.33%)	2 (6.67%)	0
X^2 value	0.659
value	0.589

ICA: internal carotid artery. values were calculated using the chi-square test.