Table 5.

Cox regression of the risk of the outcome in the traditional and two novel definitions of full collapse. Unadjusted and age & sex–adjusted models. Conventional ≥ 50% stenosis was used as reference. The outcome was preoperative recurrent ipsilateral ischemic stroke or ipsilateral retinal artery occlusion within 28 days of presenting event

Definition of full collapse	Full collapse	Unadjusted HR (95%CI)	p	Age & sex–adjusted HR (95%CI)	p
Traditional, by appearance	No	1.2 (0.5–2.8)	0.66	1.3 (0.5–2.9)	0.59
	Yes	2.9 (1.5–5.7)	0.002	3.0 (1.5–6.0)	0.002
Distal ICA diameter ≤ 2.4 mm	No	0.4 (0.1–1.6)	0.20	0.4 (0.1–1.7)	0.21
	Yes	3.6 (1.9–6.5)	< 0.001	3.7 (2.0–6.9)	< 0.001
Distal ICA diameter ≤ 2.0 mm and/or ICA ratio ≤ 0.42	No	0.5 (0.1–1.6)	0.24	0.5 (0.2–1.7)	0.27
	Yes	4.2 (2.3–7.8)	< 0.001	4.4 (2.3–8.2)	< 0.001

HR hazard ratio, ICA internal carotid artery