Table 5 Intra- and interobserver variability of TMJ measurements. Observer mean (SD), intra- and interobserver mean difference (SD) in a sample of 84 children with JIA. Distances in millimetre. Definitons of image volume orientation model and measurements given in Figs. 1 and 2(CC, condyle-corrected; RC, ramus-corrected, Diff, difference; L, left; R, right; Obs, observer)
Image volume orientation model | Side | Observer 1 | Intra-observer | Observer 2 | Observer 3 | Inter-observer | ||||
|---|---|---|---|---|---|---|---|---|---|---|
Obs1-Obs2 | Obs1-Obs3 | Obs2-Obs3 | ||||||||
1st mean (SD) | 2nd mean (SD) | Mean diff (SD) | Mean (SD) | Mean (SD) | Mean diff (SD) | Mean diff (SD) | Mean diff (SD) | |||
Fossa length | CC | R | 16.7 (1.8) | 16.7 (1.8) | 0.0 (1.0) | 16.8 (1.9) | 16.5 (2.1) | 0.0 (1.7) | 0.2 (1.4) | 0.3 (1.8) |
L | 16.7 (2.0) | 16.6 (1.9) | 0.2 (1.1) | 16.7 (1.9) | 16.6 (2.1) | 0.0 (1.4) | 0.1 (1.3) | 0.1 (1.4) | ||
Fossa length | RC | R | 17.1 (1.9) | 17.0 (1.9) | 0.2 (1.1) | 16.9 (1.9) | 17.0 (2.1) | 0.3 (1.4) | 0.0 (1.2) | − 0.2 (1.3) |
L | 17.1 (1.9) | 17.0 (2.0) | 0.0 (1.1) | 16.8 (2.0) | 17.0 (2.0) | 0.2 (1.2) | 0.0 (1.2) | − 0.2 (1.1) | ||
Fossa depth, method A | CC | R | 5.7 (1.5) | 5.7 (1.5) | − 0.1 (0.5) | 5.5 (1.1) | 5.5 (1.5) | 0.3* (1.1) | 0.1* (0.4) | − 0.2 (1.2) |
L | 5.6 (1.1) | 5.7 (1.1) | − 0.1 (0.4) | 5.3 (1.1) | 5.5 (1.2) | 0.4* (0.9) | 0.1 (0.5) | − 0.2 (1.0) | ||
Fossa depth, method A | RC | R | 5.6 (1.4) | 5.5 (1.4) | 0.1* (0.4) | 5.3 (1.3) | 5.5 (1.4) | 0.4* (0.6) | 0.1* (0.4) | − 0.2* (0.6) |
L | 5.6 (1.0) | 5.6 (1.8) | 0.0 (0.4) | 5.1 (1.0) | 5.4 (1.1) | 0.4* (0.7) | 0.2* (0.5) | − 0.2* (0.6) | ||
Fossa depth, method B | RC | R | 6.7 (2.2) | 6.6 (2.1) | 0.1 (0.5) | 6.6 (2.2) | 0.0 (0.7) | |||
L | 6.6 (1.7) | 7.0 (3.8) | − 0.1 (0.5) | 6.6 (1.8) | 0.0 (0.6) | |||||
Fossa/eminence inclination angle, method A | CC | R | 32.1 (8.5) | 32.5 (7.7) | − 0.4 (3.6) | 31.1 (6.1) | 32.1 (9.3) | 1.8* (5.7) | 0.2 (4.7) | − 1.7* (6.4) |
L | 32.4 (6.4) | 32.8 (6.2) | − 0.4 (3.1) | 30.0 (5.7) | 31.6 (7.1) | 2.5* (4.7) | 0.9 (4.1) | − 1.5* (5.5) | ||
Fossa/eminence inclination angle, method A | RC | R | 30.6 (8.0) | 32.2 (8.2) | − 1.1* (3.0) | 30.6 (7.4) | 30.8 (8.8) | 0.6 (4.4) | 0.5 (4.4) | − 0.2 (4.1) |
L | 31.1 (6.7) | 32.2 (6.4) | − 1.3* (3.3) | 29.8 (5.8) | 30.3 (7.6) | 1.3* (4.3) | 0.8 (4.3) | − 0.5 (4.5) | ||
Fossa/eminence inclination angle, method B | RC | R | 37.3 (9.4) | 35.6 (10.4) | 1.8* (6.7) | 34.4 (10.9) | 2.6* (6.2) | |||
L | 36.6 (8.9) | 36.1 (9.4) | 0.3 (4.3) | 33.9 (9.6) | 2.5* (5.0) | |||||
Mesio-lateral condyle diameter | CC | R | 16.5 (2.8) | 16.6 (2.6) | 0.0 (0.6) | 16.7 (2.7) | 16.3 (3.0) | − 0.1 (0.6) | 0.3* (1.0) | 0.4* (1.0) |
L | 16.7 (2.3) | 16.7 (2.5) | 0.0 (0.8) | 16.8 (2.3) | 16.5 (2.8) | − 0.1 (0.6) | 0.1 (0.8) | 0.1 (0.7) | ||
Anteroposterior condyle diameter | CC | R | 7.5 (1.2) | 7.5 (1.1) | 0.0 (0.6) | 7.3 (1.3) | 7.2 (1.3) | 0.2* (0.8) | 0.3* (0.8) | 0.1 (0.9) |
L | 7.5 (1.2) | 7.5 (1.4) | 0.1 (0.6) | 7.4 (1.4) | 7.2 (1.4) | 0.1* (0.6) | 0.4* (0.7) | 0.2* (0.7) |