Summary of patient characteristics
| Age at surgery | |
| Mean | 33.5 |
| Median | 32 |
| Sex | |
| Male | 27 |
| Female | 33 |
| Aetiology | |
| Primary | |
| Non-genetic | 37 |
| DYT1 | 8 |
| DYT6 | 2 |
| DYT11 | 1 |
| Secondary | 12 |
| Phenotype | |
| Torsional | 51 |
| Myoclonic | 9 |
| Age group at onset | |
| Paediatric | 43 |
| Adult | 17 |
| Duration pretreatment | |
| Up to 10 years | 14 |
| 10–20 years | 23 |
| Over 20 years | 23 |