Table 1.
Intra- and interobserver agreement and MDC95 of MRI-based measurements (mm) of total mandibular length, posterior mandibular length and condylar height in 78* children and adolescents with JIA
| OBS1 (Intraobserver) (first vs second measurements) | OBS2 (Interobserver) (OBS one vs OBS 2) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| first mean | second mean | Mean diff. | 95% LOA | first LOA % | MDC95 individ. | Mean | Mean diff. | 95% LOA | LOA % | MDC95 individ. | |
| (SD) | (SD) | (SD) | (SD) | (SD) | |||||||
| Total mandibular length Rt | 112.6 (8.4) | 111.7 (9.0) | 0.9 (2.7) |
−4.5–6.3 | 9.6 | 5.4 | 112.6 (7.6) | −0.2 (2.7) |
−4.9–5.4 | 9.6 | 5.4 |
| Total mandibular length Lt | 112.9 (7.9) | 112.4 (8.8) | 0.5 (3.5) |
−6.5–7.5 | 12.4 | 7.0 | 112.3 (7.8) | 0.6 (2.9) |
−5.6–6.0 | 10.3 | 5.8 |
| Posterior mandibular length Rt | 55.3 (7.0) | 55.8 (6.9) |
0.5 (2.4) |
−4.3–5.2 | 17.2 | 4.8 | 55.4 (6.3) | −0.1 (2.4) |
−4.3–5.3 | 17.3 | 4.8 |
| Posterior mandibular length Lt | 55.4 (6.4) | 54.8 (6.5) |
0.6 (2.3) |
−4.0–5.2 | 16.6 | 4.6 | 55.4 (6.1) | 0.0 (2.9) |
−5.6–6.0 | 20.9 | 5.8 |
| Condylar height Rt | 19.5 (3.5) | 19.0 (3.4) |
0.5 (2.7) |
−4.9–5.9 | 55.4 | 5.4 | 19.8 (3.4) | −0.3 (1.7) |
−2.8–4.0 | 34.3 | 3.4 |
| Condylar height Lt | 19.0 (3.4) | 19.1 (3.2) |
−0.1 (2.4) |
−4.6–5.0 | 50.5 | 4.8 | 19.8 (3.4) | −0.8 (2.2) |
−3.5–5.3 | 44.4 | 4.4 |
Diff: Difference. LOA: Limit of agreement. Lt: Left side. MDC95individ: Individual minimal detectable change. MRI: Magnetic resonance imaging. OBS: Observer. Rt: Right side. SD: Standard deviation.
* 78* 78 of the 90 children and adolescents included had MRIs available for these analyses.