Table 3.

Inter-rater agreement for LI and IVWI assessments.

		Rater*			Agreement
Variable		R1	R2	P-value†	% Agree‡	Cohen’s κ	(95% CI)
Luminal Imaging
Pattern of involvement§	Concentric	108 (55.7)	45 (23.2)	<0.001	47.9%	0.02	(−0.07–0.11)
	Eccentric	86 (44.3)	149 (76.8)
Diagnosis	ICAD	69 (34.3)	152 (75.6)	<0.001	35.3%	0.04	(−0.03–0.12)
	RCVS	13 (6.5)	5 (2.5)
	IVas	25 (12.4)	22 (10.9)
	Uncertain/equivocal	94 (46.8)	22 (10.9)
Vessel Wall Imaging
Diagnosis	ICAD	81 (40.3)	93 (46.3)	0.003	81.6%	0.72	(0.64–0.80)
	RCVS	55 (27.4)	65 (32.3)
	IVas	62 (30.8)	43 (21.4)
	Uncertain/equivocal	3 (1.5)	0 (0.0)

ICAD = intracranial atherosclerotic disease; LI = luminal imaging; RCVS = reversible cerebral vasoconstrictive syndrome; IVas = inflammatory vasculopathy; IVWI = vessel wall imaging;

^*Values are no. (%);

^†Test for average difference between raters;

^‡Percent of lesions where raters gave the same classification;

^§Excluding 7 lesions where one rater did not determine eccentricity.