Table 1. Characteristics of the study population.
| Family history (n) | |||||||
|---|---|---|---|---|---|---|---|
| Type of dystonia | Patients (n) | Male (%) | Mean±SD age at onset | Mean±SD age | Positive | Negative | Unknown |
| Generalized | 38 | 61.9 | 19.1±17.8 | 40.9±15.1 | 5 | 26 | 7 |
| Segmental | 68 | 48.4 | 43.5±19.0 | 59.1±12.8 | 6 | 40 | 22 |
| Focal | 461 | ||||||
| Cervical | 155 | 39.9 | 42.8±13.1 | 54.9±13.7 | 22 | 62 | 71 |
| Blepharospasm | 63 | 30.2 | 56.9±10.7 | 68.6±10.3 | 2 | 29 | 32 |
| Writer's cramp | 53 | 54.7 | 41.4±10.9 | 55.4±10.8 | 1 | 22 | 30 |
| Musician's dystonia | 168 | 73.2 | 34.8±10.5 | 43.8±12.0 | 13 | 135 | 20 |
| Spasmodic dysphonia | 18 | 33.3 | 50.9±11.3 | 65.4±11.2 | 0 | 3 | 15 |
| Other | 4 | 50.0 | 58.2±10.9 | 61.5±12.2 | 1 | 3 | 0 |