Table 4.
Agreement of Noncontrast Computed Tomography markers across one gold rater stratified with Cohen’s kappa.
| NCCT Marker | Intrarater | Cohen’s Kappa (95% CI) | p-Value |
|---|---|---|---|
| Shape Markers | |||
| IRR Shape | Neurorad Fellow | 0.87 (0.83–0.91) | <0.001 |
| Satellite Sign | Neurorad Fellow | 0.93 (0.88–0.97) | <0.001 |
| Island Sign | Neurorad Fellow | 0.95 (0.90–1.00) | <0.001 |
| Density Markers | |||
| HET Density | Neurorad Fellow | 0.79 (0.73–0.84) | <0.001 |
| Swirl Sign | Neurorad Fellow | 0.94 (0.91–0.98) | <0.001 |
| Black Hole Sign | Neurorad Fellow | 0.98 (0.95–1.00) | <0.001 |
| Blend Sign | Neurorad Fellow | 0.96 (0.90–1.00) | <0.001 |
| Fluid Sign | Neurorad Fellow | 0.95 (0.90–1.00) | <0.001 |
| Hypodensities | Neurorad Fellow | 0.81(0.78–0.86) | <0.001 |
Legend: Intrarater agreement for nine different Noncontrast Computed Tomography (NCCT) markers with stratified Cohen’s kappa across one neuroradiology fellow stratified across two reading. Neurorad Fellow, neuroradiology fellow.