Table 2 The results of the reliability analysis of the measurements of vertebral rotation on standing plain radiograph and prone scanogram according to the method of Perdriolle, and on prone CT and supine MRI according to the method of Aaro and Dahlborn.
Intraobserver reliability | ||||
|---|---|---|---|---|
Plain Radiographs, (Perdriolle) | CT Scanogram, prone (Perdriolle) | CT, prone (Aaro and Dahlborn) | MRI, Supine (Aaro and Dahlborn) | |
Systematic error (Mean) | 1° | 1.1° | 0.2° | 0.7° |
Random error (SD) | 7.1 ° | 5.1 ° | 2.3 ° | 3.1 ° |
Repeatability coefficient | 10.2 ° | 7.2 ° | 3.2 ° | 4.4 ° |
Coefficient of variation | 39.5% | 32.8% | 18.4% | 27.3% |
Intraclass correlation coefficient (ICC) | 0.76 | 0.83 | 0.95 | 0.89 |
Correlation coefficient (r2) on linear regression analysis | 0.61 | 0.69 | 0.91 | 0.81 |