Table 2. Percent stenosis categorized by ASITN/SIR collateral grade by vessela.
| Vessel | No collaterals | Partial collaterals | Complete collaterals | P-value |
|---|---|---|---|---|
| ICA | 65 (8) | 76 (5) | 76 (16) | 0.0038b |
| MCA | 63 (8) | 68 (11) | 86 (15) | 0.0001c |
| VA | 63 (9) | 72 (6) | 81 (11) | 0.0001b |
| BA | 64 (9) | 75 (7) | 82 (8) | 0.0001b |
| Combined | 64 (12) | 70 (6) | 76 (10) | 0.0808 |
| Overall | 63 (9) | 71 (9) | 81 (12) | 0.0001d |
ASITN/SIR, American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology; BA, basilar artery; ICA, internal carotid artery; MCA, middle cerebral artery; VA, vertebral artery.
a
Data presented are mean (s.d.). Sample sizes are given in Table 1.
b
Tukey's post hoc no<partial, complete.
c
No, partial<complete.
d
No<partial<complete.