Demographics
| Tardive | Idiopathic | |
| Total number of patients | 24 | 92 |
| Mean (SD) age (y) | 59.1 (SD 16.1) (range 30 to 81) | 60.0 (SD 12.6) (range 14 to 82) |
| Sex (M, F) | 7 (29.2%), 17 (70.8%) | 23 (25.0%), 69 (75.0%) |
| Mean (SD) duration of symptoms (y) | 8.4 (7.6) (range 0.6 to 24) | 9.9 (SD 9.1) (range 0.5 to 42) |
| Mean (SD) duration of follow up (y) | 4.4 (3.4) (range 0.5 to 10) | 5.6 (SD 7.1) (range 0.3 to 17) |
| Dystonia confined to orofacial muscles1-150 | 10 (41.7%) | 12 (13%) |
| Associated movement disorders (n (%)): | ||
| Cervical dystonia1-150 | 10 (41.7) | 63 (68.5) |
| Blepharospasm | 9 (37.5) | 52 (56.5) |
| Limb dystonia | 4 (16.7) | 16 (17.4) |
| Spasmodic dysphonia | 1 (4.2) | 12 (13.0) |
| Tremor | 5 (20.8) | 17 (18.5) |
| Parkinsonism1-150 | 5 (20.8) | 2 (2.2) |
| Bruxism | 8 (33.3) | 32 (34.8) |
| Family history (n (%)): | ||
| Tremor | 7 (25.9) | 24 (26.8) |
| Parkinsonism | 3 (11.1) | 8 (8.7) |
| Dystonia | 0 | 5 (5.4) |
| Bruxism | 0 | 2 (2.2) |
| Blepharospasm | 0 | 2 (2.2) |
↵1-150 p<0.05.