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Table 2: Multivariable linear regression results
Characteristic PI^{^a} 95% Confidence Interval P Value
Recent IV contrast 0.34 (0.12–0.96) .04
ASPECTS 0.74 (0.59–0.93) .01
Collateral grade (1 = reference group) 
 2 2.27 (0.78–6.60) .13
 3 8.46 (2.10–34.06) .004
↵a Outcome is log2 core CTP.

Characteristic	PI^{^a}	95% Confidence Interval	P Value
Recent IV contrast	0.34	(0.12–0.96)	.04
ASPECTS	0.74	(0.59–0.93)	.01
Collateral grade (1 = reference group)
2	2.27	(0.78–6.60)	.13
3	8.46	(2.10–34.06)	.004