Table 2.
Intraobserver 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) | 0.80 | 0.40 | 0.13 | 0.65 | 0.40 |
| Limits of agreement (mm) | − 4.2 to 5.8 | − 4.0 to 4.8 | − 3.5 to 3.7 | − 3.1 to 4.3 | − 3.6 to 4.4 |
| SD (mm) | 2.5 | 2.2 | 1.9 | 2 | 2.1 |
| Variance (mm2) | 6.4 | 5.0 | 3.4 | 3.9 | 4.2 |
| ICC (r) | 0.91 | 0.89 | 0.95 | 0.83 | 0.83 |
| Inner-inner edge | |||||
| Mean difference (mm) | 0.43 | 0.10 | 0.52 | 0.35 | − 0.15 |
| Limits of agreement (mm) | − 3.1 to 3.9 | − 3.0 to 3.2 | − 2 to 3.1 | − 3.1 to 3.8 | − 4.4 to 4.2 |
| SD (mm) | 1.8 | 1.6 | 1.3 | 1.7 | 2.2 |
| Variance (mm2) | 3.1 | 2.5 | 1.7 | 3.1 | 4.8 |
| ICC (r) | 0.95 | 0.95 | 0.97 | 0.86 | 0.86 |
| P value (t test) | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
| P value (F test) | 0.03 | 0.03 | 0.03 | 0.46 | 0.65 |
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)