Interrater reliability and agreement regarding graduation and treatment decisions of vasospasm on CT
| Interrater Reliability and Agreementa | ||||
|---|---|---|---|---|
| All Raters (n = 3) | Senior (n = 2) | |||
| Agreement (%) | Interrater Reliability κ (95% CI) | Agreement (%) | Interrater Reliability κ (95% CI) | |
| First rating (CTA) | ||||
| Detection of severe vasospasm in any arterial segment (>50% narrowing) | 63 | 0.27 (0.11–0.42) | 61 | 0.28 (0.10–0.46) |
| Endovascular treatment? | 62 | 0.23 (0.06–0.39) | 61 | 0.23 (−0.01–0.46) |
| Second rating (CTA + CTP) | ||||
| Detection of severe vasospasm in any arterial segment (>50% narrowing) | 65 | 0.31 (0.15–0.46) | 73 | 0.46 (0.26–0.66) |
| Endovascular treatment? | 75 | 0.47 (0.30–0.64) | 89 | 0.73 (0.55–0.91) |
| Perfusion deficit? | 92 | 0.77 (0.63–0.91) | 93 | 0.82 (0.66–0.97) |
↵a Interrater reliability was calculated using the Fleiss κ for all raters and Cohen κ for senior raters.