Group | No of follow-ups | No of ISR | HR (95.0% CI) | P value |
PAT | 204 | 60 | 1.00 (Reference) | – |
ICA-OCC | 36 | 15 | 1.34 (0.76 to 2.37) | 0.31 |
CVA-OCC | 77 | 36 | 1.66 (1.09 to 2.51) | 0.02 |
C-OCC | 13 | 9 | 3.34 (1.64 to 6.77) | 0.001 |
C-OCC, combined occlusions; CVA-OCC, contralateral vertebral artery occlusion; ICA-OCC, internal carotid artery occlusion; ISR, in-stent restenosis; PAT, patent in bilateral internal carotid artery and contralateral vertebral artery.