Table 3.

Subgroup analysis of the effect of collateral status on good mRS (≤2).

Subgroup	Number of patients	ORs (95%CI)	P value for interaction
Age (yrs)			0.192
<65 yr	81	4.69 (3.18 to 7.80)
≥65 yr	138	3.95 (2.94 to 6.75)
History of ischemic stroke			0.002
Yes	34	7.81 (2.34, 19.21)
No	185	3.47 (2.88, 5.47)
Statin use			0.021
Yes	138	4.77 (3.78, 7.01)
No	81	3.42 (1.99, 7.51)
SBP at hospital arrival			0.85
<140 mmHg	68	4.02 (1.94, 7.04)
≥140 mmHg	151	3.98 (2.37, 6.96)
NIHSS at hospital arrival			0.174
5–15	71	3.57 (1.78, 6.47)
≥16	148	3.94 (2.14, 5.17)
Location of intracranial artery occlusion			0.090
Intracranial ICA	73	3.94 (1.85, 7.02)
M1 segment	123	4.01 (2.57, 6.11)
M2 segment	23	9.51 (1.04, 19.17)