[Retracted] Different Grades of Collateral Circulation for Evaluating Cerebral Hemodynamic Status in Carotid Artery Stenosis

Table 3

Correlation between degree of carotid stenosis and collateral circulation.

Collateral circulation	50–70%, n = 21	70–90%, n = 35	Near-occlusion, n = 68	value
Grade 1	19 (90.48%)	25 (71.43%)	24 (35.29%)	<0.0001
Grade 2	1 (4.76%)	7 (20.00%)	22 (32.35%)
Grade 3	1 (4.76%)	3 (8.57%)	22 (32.35%)

Note: chi-square test. ; ; .