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Table 2: Spearman rank ρ (95% CI) of collateral measures with outcomes for all studies and per CTA acquisition phase
All Studies (N = 442) Early Arterial (n = 91) Peak Arterial (n = 56) Equilibrium (n = 123) Peak Venous (n = 114) Late Venous (n = 58)
Follow-up infarct volume 
    Visual collateral score −.44 (−.53 to −.36)^{^a} −.35 (−.55 to −.13)^{^a} −.46 (−.65 to −.21^{^a} −.51 (−.64 to −.35)^{^a} −.49 (−.64 to −.29^{^a} −.47 (−.66 to −.24)^{^a}
    Quantitative collateral score −.46 (−.54 to −.37)^{^a} −.45 (−.62 to −.24)^{^a} −.46 (−.66 to −.19)^{^a} −.51 (−.65 to −.34)^{^a} −.41 (−.56 to −.20)^{^a} −.52 (−.70 to −.29)^{^a}
mRS at 90 days 
    Visual collateral score −.31 (−.39 to −.22)^{^a} −.19 (−.38 to .03) −.22 (−.49 to −.04) −.28 (−.49 to −.15)^{^a} −.29 (−.45 to −.09)^{^a} −.41 (−.63 to −.19)^{^a}
    Quantitative collateral score −.40 (−.48 to −.32)^{^a} −.35 (−.53 to −.13)^{^a} −.34 (−.55 to −.10)^{^a} −.38 (−.58 to −.25)^{^a} −.30 (−.42 to −.08)^{^a} −.37 (−.59 to −.12)^{^a}
↵a Significant correlation at P < .01.