Table 2.
Reliability and validity results for the six radiographic parameters
| Reliability | Validity | ||||
|---|---|---|---|---|---|
| Intraobserver R. | Interobserver R. | Convergent V. | Discriminant V. | ||
| ICC 2,1 (95% CI) [n = 35, 2 measures] | ICC 2,1 (95% CI) [n = 35, 3 observer] | Pearson’s r [n = 7, neutral] | Pearson’s r [n = 49/91, w/variation] | ES η 2 [n = 91] | |
| Vertical displacement | |||||
| CC | 0.956 (0.712–0.993) | 0.985 (0.928–0.997) | 0.833* | 0.778*/0.706* | 0.743 |
| AC–DC | 0.993 (0.982–0.997) | 0.998 (0.996–1.000) | 0.972* | 0.960*/0.939* | 0.952 |
| CCran | 0.827 (-0.440–0.956) | 0.964 (0.909–0.984) | 0.495 | 0.460*/0.473* | 0.905 |
| Horizontal displacement | |||||
| OL | 0.805 (0.647–0.897) | 0.945 (0.906–0.970) | −0.488 | −0.433*/−0.385* | 0.587 |
| LE | 0.925 (0.855–0.961) | 0.987 (0.977–0.993) | 0.387 | 0.383*/0.346* | 0.713 |
| GC–PC | 0.985 (0.970–0.992) | 0.995 (0.991–0.997) | 0.968* | 0.962*/0.952* | 0.964 |
Reliability is calculated for intra- and interobserver measurement and presented with intraclass Coefficient (ICC 2,1) and 95% Confidence Interval (95% CI). Convergent validity are presented by Pearson’s correlation coefficient (Pearson’s r) and are calculated for neutral orientation only (n = 7), 10° projectional variation included (n = 49) and 20° projectional variation included (n = 91). Discriminant validity is represented by effect size (ES η 2)
* Values are significant at level <0.05