Table 2. Inter-rater reliability (quadratic-weighted kappa) of the three properties of leptomeningeal collateral status (prominence, extent, and retrograde filling time) assessed using dynamic CTA in this study and stratified by anterior (ACA–MCA) and posterior (PCA–MCA) regions18, 19.
|
Anterior (ACA–MCA) region |
Posterior (PCA–MCA) region |
|||||
|---|---|---|---|---|---|---|
| Extent | Prominence | Time | Extent | Prominence | Time | |
| Agreement (%) | 92.5 | 93.75 | 80 | 98.75 | 93.75 | 93.75 |
| Expected agreement (%) | 72.5 | 84.50 | 67.5 | 89.5 | 83.75 | 77.5 |
| Weighted kappa | 0.73 | 0.6 | 0.4 | 0.88 | 0.61 | 0.72 |
| P value | <0.01 | <0.01 | 0.04 | <0.01 | <0.01 | <0.01 |
Abbreviations: ACA–MCA, anterior cerebral artery–middle cerebral artery; CTA, computed tomography angiography; PCA–MCA, posterior cerebral artery–middle cerebral artery.