Table 2.

p-values for comparison of 7-day NIHSS and the narrowest diameter by the collateral grade.

	Collateral Grade			Kruskal–Wallis Test
	0 vs. 1	0 vs. 2	1 vs. 2
7-day NIHSS	0.966	0.030	0.007	<0.001
Narrowest diameter of AComA/cA1 complex, mm	0.354	<0.001	0.014	<0.001