Table 1.

Design summary of the two included studies

	Johansson et al. [6]	Gu et al. [7]
Years on inclusion	2007–2009	2010–2014
Site	Umeå, Sweden	Umeå, Sweden
Main purpose of original study	Assess risk of recurrent stroke in all ≥ 50% stenosis	Assess risk of recurrent stroke in near-occlusion
Design	Prospective	Retrospective
Case detection approach	Diagnosis of ≥ 50% stenosis in clinic routine	Re-assessment of 4440 consecutive CTAs
Total cases with symptomatic ≥ 50% stenosis	230	514
Cases excluded due to no relevant CTA (% of total)	164 (71)	149 (29)
Included cases (% of total)	66 (29)	365 (71)
Conventional ≥ 50% stenosis n (%)	49 (74)	266 (73)
Near-occlusion without full collapsea n (%)	12 (18)	57 (16)
Near-occlusion with full collapsea n (%)	5 (8)	42 (12)

CTA computed tomography angiography

^aDivision by traditional definition