Table 3.
Comparison of individual MMT grades by clinical group
| PM (n = 65) |
DM (n = 50) |
JDM (n = 57) |
||||
|---|---|---|---|---|---|---|
| Muscle groups | Median | [25%, 75%] | Median | [25%, 75%] | Median | [25%, 75%] |
| Neck flexors | 7.0 | [6.0, 9.0] | 7.0 | [5.0, 8.0] | 7.0 | [6.0, 8.5] |
| Neck extensors | 10.0 | [7.5, 10.0] | 9.0 | [8.0, 10.0] | 9.0 | [8.0, 10.0] |
| Shoulder elevators | 10.0 | [9.0, 10.0] | 10.0 | [10.0, 10.0] | 10.0 | [9.0, 10.0] |
| Shoulder abductors | 7.0 | [6.0, 8.0] | 8.0 | [7.0, 9.0] | 8.0 | [7.0, 10.0] |
| Elbow flexors | 9.0 | [7.0, 10.0] | 9.5 | [7.0, 10.0] | 9.0 | [7.0, 10.0] |
| Wrist flexorsa,b | 10.0 | [8.0, 10.0] | 8.0 | [7.0, 10.0] | 9.0 | [8.0, 10.0] |
| Wrist extensors | 9.0 | [8.0, 10.0] | 9.0 | [7.8, 10.0] | 9.0 | [8.0, 10.0] |
| Hip flexorsa,c,d | 4.0 | [3.0, 7.0] | 6.0 | [3.0, 7.3] | 7.0 | [6.0, 9.0] |
| Hip extensorsc,d | 4.0 | [3.0, 6.5] | 6.0 | [3.0, 7.0] | 8.0 | [6.5, 9.5] |
| Hip abductorsb,c,e | 5.0 | [3.5, 7.5] | 7.0 | [5.8, 8.3] | 9.0 | [7.0, 10.0] |
| Knee extensorsa,b,c | 8.0 | [7.0, 9.5] | 9.0 | [7.8, 10] | 10.0 | [9.0, 10.0] |
| Ankle dorsiflexors | 9.0 | [8.0, 10.0] | 10.0 | [9.0, 10.0] | 10.0 | [8.0, 10.0] |
| Ankle plantar flexorsa | 9.0 | [8.0, 10.0] | 10.0 | [9.0, 10.0] | 10.0 | [9.0, 10.0] |
The strength of muscle groups using MMT was compared among clinical groups using the Kruskal–Wallis test; if significant, post hoc pairwise comparisons were done with Wilcoxon rank sum test and resulting P-values were adjusted by Holm's method. aPM is significantly different from DM, P ≤0.05. bDM is significantly different from JDM, P-value ≤0.05. cPM is significantly different from JDM, P-value ≤0.01. dDM is significantly different from JDM. P-value ≤0.01. eDM is significantly different from PM. P ≤0.01.