TABLE 2.

Measures of Concordance Between Collateral Scores Assessed on CT and DSA (Reference Standard)

Grading Method	Ordinal Score		Dichotomized Score
	Agreement (%)	CCC (95% CI)	Agreement (%)	CCC (95% CI)
CS single-phase	53	0.09 (−0.06–0.24)	78	0.02 (−0.13–0.17)
CS 3-phase	48	0.08 (−0.06–0.22)	81	−0.11 (−0.26–0.05)
CS multiphase	41	0.23 (0.08–0.37)	78	0.01 (−0.14–0.15)
CS tMIP	29	0.19 (0.05–0.32)	82	−0.02 (−0.18–0.13)
mASITN 3-phase	29	0.10 (−0.02–0.21)	54	0.12 (−0.01–0.25)
mASITN multiphase	40	0.27 (0.12–0.40)	60	0.24 (0.09–0.38)

CS indicates collateral score;