Interrater reliability and agreement for the graduation of vasospasm on CTa
| First Rating (CTA) | Second Rating (CTA + CTP) | |||
|---|---|---|---|---|
| Agreement (%) | Interrater Reliability κ (95% CI) | Agreement (%) | Interrater Reliability κ (95% CI) | |
| Supraclinoid ICA | ||||
| Right (n = 68) | 87 | 0.31 (0.12–0.51) | 86 | 0.13 (−0.03–0.28) |
| Left (n = 70) | 89 | 0.27 (0.07–0.48) | 91 | 0.30 (0.05–0.56) |
| MCA, M1 | ||||
| Right (n = 68) | 87 | 0.58 (0.46–0.69) | 82 | 0.43 (0.27–0.60) |
| Left (n = 67) | 87 | 0.55 (0.39–0.70) | 86 | 0.50 (0.34–0.67) |
| MCA, M2 | ||||
| Right (n = 71) | 83 | 0.38 (0.22–0.53) | 80 | 0.25 (0.05–0.45) |
| Left (n = 71) | 82 | 0.16 (−0.01–0.32) | 86 | 0.32 (0.15–0.49) |
| ACA, A1 | ||||
| Right (n = 68) | 83 | 0.50 (0.36–0.64) | 75 | 0.36 (0.20–0.53) |
| Left (n = 67) | 85 | 0.61 (0.48-0.74) | 76 | 0.36 (0.18–0.55) |
| ACA, A2 | ||||
| Right (n = 70) | 77 | 0.37 (0.20-0.53) | 70 | 0.20 (0.06–0.35) |
| Left (n = 70) | 78 | 0.40 (0.24–0.55) | 66 | 0.12 (−0.03-0.26) |
| Basilar (n = 70) | 93 | 0.37 (0.19–0.55) | 91 | 0.28 (0.09–0.47) |
| PCA, P1 | ||||
| Right (n = 70) | 89 | 0.53 (0.37–0.68) | 85 | 0.13 (−0.02–0.28) |
| Left (n = 70) | 87 | 0.44 (0.29–0.60) | 86 | 0.18 (0.00–0.35) |
| PCA, P2 | ||||
| Right (n = 71) | 89 | 0.36 (0.17–0.55) | 89 | 0.15 (0.05–0.25) |
| Left (n = 71) | 89 | 0.43 (0.20–0.65) | 91 | 0.21 (0.08–0.34) |
Note:—PCA indicates posterior cerebral artery.
↵a Vasospasm was graded using a tripartite scale for each vessel separately. The scale included no vasospasm, mild vasospasm <50%, and severe vasospasm >50%. Interrater reliability was calculated using the Krippendorff α.