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Table 1: Baseline characteristics
Characteristic Recent IV Contrast^{^a} No Recent IV Contrast^{^a} Overall^{^a} P Value^{^b}
Count 23 15 38 NA
Age (yr) 70.5 ± 16.0 76.5 ± 18.4 72.9 ± 17.0 .32
Serum creatinine level (mg/dL) 1.08 ± 0.34 1.12 ± 0.29 1.10 ± 0.32 .78
Female 15 (65%) 7 (47%) 22 (58%) .32
Time since last known well (hr) 12.5 ± 5.6 9.3 ± 7.8 11.2 ± 6.6 .19
ASPECTS 5.4 ± 2.0 7.5 ± 2.2 6.2 ± 2.3 .005
CTP core (median) (range) (mL) 4 (0–234) 13 (0–208) 6 (0–234) .28
Collateral grade .71
 1 15 (65%) 9 (60%) 24 (63%) 
 2 6 (26%) 3 (20%) 9 (24%) 
 3 2 (9%) 3 (20%) 5 (13%) 
Thrombectomy 11 (48%) 12 (80%) 23 (61%) .09
Note:—NA indicates not applicable.
↵a Values are No., No. (%), or mean ± SD.
↵b P values are from the Fisher exact test or 2-sample t test with unequal variances.

Characteristic	Recent IV Contrast^{^a}	No Recent IV Contrast^{^a}	Overall^{^a}	P Value^{^b}
Count	23	15	38	NA
Age (yr)	70.5 ± 16.0	76.5 ± 18.4	72.9 ± 17.0	.32
Serum creatinine level (mg/dL)	1.08 ± 0.34	1.12 ± 0.29	1.10 ± 0.32	.78
Female	15 (65%)	7 (47%)	22 (58%)	.32
Time since last known well (hr)	12.5 ± 5.6	9.3 ± 7.8	11.2 ± 6.6	.19
ASPECTS	5.4 ± 2.0	7.5 ± 2.2	6.2 ± 2.3	.005
CTP core (median) (range) (mL)	4 (0–234)	13 (0–208)	6 (0–234)	.28
Collateral grade				.71
1	15 (65%)	9 (60%)	24 (63%)
2	6 (26%)	3 (20%)	9 (24%)
3	2 (9%)	3 (20%)	5 (13%)
Thrombectomy	11 (48%)	12 (80%)	23 (61%)	.09