Table 1. Data describing patients' history of disease, muscle and cognitive functions (quantitative variables are mean±SD).
| History | Age at initial symptoms (yrs) | Initial symptom: psychomotor delay (%) | Initial symptom: abnormal gait (%) | Initial symptom: high CK (%) | Age at diagnosis (yrs) | Age at follow-up end-point (yrs) | Age at first walking (months) | Age at loss of ambulation (yrs) | Age at becoming chair-ridden (yrs) | Age at beginning of physiotherapy (yrs) | CK level (IU) | Phenotype fat/thin/normal (%) |
| Cluster A N = 14 | 1.3±0.6 | 100 | 0 | 0 | 4.1±2.1 | 13.5±3.7 | 20.0±7.9 | 9.0±1.6 | 8.4±1.5 | 4.5±2.0 | 17765 | 50/29/21 |
| Cluster B N = 19 | 3.6±1.7 | 11 | 68 | 0 | 5.6±1.7 | 15.3±3.8 | 16.0±4.8 | 9.6±1.3 | 9.5±1.3 | 6.3±1.4 | 8166 | 32/42/26 |
| Cluster C N = 16 | 3.8±2.0 | 0 | 44 | 13 | 7.2±1.9 | 16.8±1.6 | 15.0±3.8 | 12.6±2.0 | 11.5±1.5 | 8.1±2.8 | 9000 | 12/69/19 |
| Cluster D N = 21 | 3.3±1.72 | 0 | 33 | 19 | 4.5±1.9 | 15.7±3.4 | 16.0±3.4 | 10.0±1.4 | 9.0±.0 | 5.4±1.7 | 9566 | 29/38/33 |
| Overall N = 75 | 3.0±1.86 | 24 | 65 | 10 | 5.3±2.1 | 15.4±3.4 | 16.8±5.1 | 10.3±1.9 | 9.5±1.7 | 6.0±2.3 | 9680 | 32/40/28 |