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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.

From: Measurement of vertebral rotation in adolescent idiopathic scoliosis with low-dose CT in prone position - method description and reliability analysis

  Intraobserver reliability
  Plain Radiographs,
(Perdriolle)
CT Scanogram, prone
(Perdriolle)
CT, prone
(Aaro and Dahlborn)
MRI, Supine
(Aaro and Dahlborn)
Systematic error (Mean) 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