| Diagnosis | No of samples | US | MR | CK (U/l) | Fast myosin (μg/l) | Slow myocin (μg/l) | Fast/slow ratio |
| Normal | 51 | – | – | 102 (8) | 625 (62) | 1535 (166) | 0.3 |
| Grade I | 12 | (−) o (+) | – | 202 (22) | 2880 (159) | 1281 (197) | 2.2 |
| Grade II | 16 | ++ | ++ | 482 (47) | 3432 (402) | 3722 (700) | 0.9 |
| Grade III | 10 | +++ | +++ | 739 (245) | 8055 (2200) | 6518 (124) | 1.2 |
Data are expressed as mean (SE).
US, ultrasonography; MR, magnetic resonance; CK, creatine kinase.
Statistical ANOVA was found to be very significant for every parameter (p<0.001).