Analysis of agreement using AC1 between surgeon reviewers from IO and PO images and between individual surgeon reviewers and the neuroradiologists rating the PO images.
| Comparisons | AC1 | 95% CI |
| All raters | 0.95 | 0.93–0.97 |
| Reviewer 1 and Reviewer 2 | 0.97 | 0.96–0.99 |
| Reviewer 1 and Reviewer 3 | 0.96 | 0.94–0.98 |
| Reviewer 2 and Reviewer 3 | 0.98 | 0.97–1.00 |
| Reviewer 1 and neuroradiologist | 0.93 | 0.90–0.96 |
| Reviewer 2 and neuroradiologist | 0.93 | 0.90–0.96 |
| Reviewer 3 and neuroradiologist | 0.92 | 0.90–0.95 |
Abbreviations: AC1, first-order agreement coefficient; IO, intraoperative; PO, postoperative.