Interobserver change measurementsa
| Parameters | Height Change (mm) | Width Change (mm) | Neck Change (mm) | Volume Change (mL) |
|---|---|---|---|---|
| Observer A measurement | 0.2 (−0.1–0.7) | 0.1 (−0.2–0.4) | 0 (−0.2–0.4) | 0.00001 (−0.0043–0.0011) |
| Observer B measurement | 0.1 (−0.1–0.5) | 0.1 (−0.2–0.6) | 0 (−0.1–0.3) | − |
| Observer C measurement | − | − | − | 0.0015 (−0.0054–0.0106) |
| Absolute Diffobs | 0.4 (0.2–0.7) | 0.4 (0.2–0.6) | 0.3 (0.1–0.7) | 0.0057 (0.0024–0.0135) |
| ICCagreement (95% CI) | 0.46 (0.27−0.61) | 0.45 (0.26−0.60) | 0.26 (0.06−0.46) | 0.76 (0.65−0.76) |
Note:—– indicates no measurement; ICCagreement, Intraclass correlation coefficient on absolute agreement between observers’ measurements; Absolute Diffobs, absolute difference between observers’ measurements.
↵a Change between baseline and follow-up measurements of the 2D height, width, neck and 3D volume of the aneurysm by observers A and B for 2D and observers A and C for 3D. Total: 84 baseline–follow-up pairs measured by 2 observers. Substantial positive differences between baseline and follow-up may indicate growth of the aneurysm. Each measurement is provided as a median (quartiles 1–3). Reliability of the differences is provided in the bottom row as the ICC on absolute agreement (95% confidence interval).