Pial collateral grades
| Diabetic (n=22) | Non-diabetic (n=82) | p Value | |
| Good (grades 1, 2) | 15 (68.2%) | 59 (71.9%) | 0.734 |
| Poor (grades 3–5) | 7 (31.8%) | 23 (28.0%) | 0.459 |
There was no association between diabetes and pial collateral grade (p=0.7290, Pearson's χ2).