Table 3.
Interobserver variance of inner vs. outer aortic measurements as described by Bland and Altman
| Sinuses of Valsalva | Sinotubular junction | Ascending aorta | Aortic arch | Descending aorta | |
|---|---|---|---|---|---|
| Outer-outer edge | |||||
| Mean difference (mm) | − 0.93 | 0.50 | − 0.60 | 0.40 | 0.30 |
| Limits of agreement (mm) | − 8.9 to 7.1 | − 7.5 to 8.5 | − 11.4 to 10.2 | − 3.0 to 3.8 | − 3.7 to 3.3 |
| SD (mm) | 4.1 | 4.1 | 5.5 | 1.8 | 1.8 |
| Variance (mm2) | 16.9 | 16.8 | 30.1 | 3.1 | 3.1 |
| ICC (r) | 0.75 | 0.67 | 0.48 | 0.83 | 0.88 |
| Inner-inner edge | |||||
| Mean difference (mm) | − 0.43 | 0.18 | 0.15 | − 0.05 | 0.20 |
| Limits of agreement (mm) | − 4.2 to 3.3 | − 5.6 to 5.9 | − 4.7 to 4.4 | − 2.7 to 2.8 | − 2.7 to 2.5 |
| SD (mm) | 1.9 | 2.9 | 2.3 | 1.4 | 1.3 |
| Variance (mm2) | 3.7 | 8.8 | 5.4 | 2.0 | 1.7 |
| ICC (r) | 0.94 | 0.82 | 0.89 | 0.89 | 0.92 |
| P value (t test) | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
| P value (F test) | < 0.001 | < 0.05 | < 0.001 | 0.16 | 0.07 |
Intraclass correlation coefficient (ICC) values are given for outer and inner measurements. T-test was performed for comparison of mean differences and F-test for comparison of variances
Significant differences are in bold (significant at p < 0.05)