Published individual outcome data on patients with primary forms of dystonia (and myoclonus dystonia) operated on with deep brain stimulation
| Primary | Subtype | No of individual patient data | Age at surgery, mean (SD) | Duration of symptoms, mean (SD) | Preop severity score, mean (SD) | Percentage improvement in motor/severity score following deep brain stimulation, mean (SD), IQR | References |
| Generalised | DYT1 positive | 91 | 22.6 (12.4) | 13.4 (11.7) | 53.8 (23.1) | 67.5 (27.7), 53.3–92.3 | 4–7 9 23 24 25 26 29 34 41 50–60 |
| Generalised | DYT1 negative | 108 | 31.3 (16.2) | 15.4 (11.1) | 54.4 (23.6) | 55.8 (26.6), 38.6–79.3 | 4–7 9 24 28 29 33 41 50 51 55–63 |
| Generalised | Unknown | 10 | 36.9 (16.1) | 17.0 (12.8) | 57.5 (22.7) | 51.9 (25.3), 20.8–71.4 | 6 10 23 26 64 |
| Focal | Writer's cramp | 6 | 46.6 (17.4) | 11.8 (9.3) | 3.3 (0.5) | 92 (12.9), 75–100 | 65 66 |
| Focal | Spasmodic torticollis | 67 | 50.0 (12.7) | 10.7 (7.4) | 24.9 (15.3) | 48.3 (41.2), 26–78 | 4 5 10 19 23 26 30 34 36 40 50 58 67–71 |
| Focal/segmental | Meige | 17 | 56.1 (9.1) | 8.5 (9.3) | 21.9 (11.0) | 64.3 (29.5), 55.5–82.2 | 23 38–40 45 46 72 73 |
| Focal/segmental | Mixed distribution | 39 | 47.7 (15.6) | 12.6 (7.2) | 30.5 (16.1) | 57.1 (24.0), 38.5–79.3 | 4 13 14 25 26 53 58 60 74–77 |
| Focal/segmental | Axial/camptocormia | 6 | 48.7 (15.1) | 12.4 (6.9) | 30.3 (16.1) | 66 (39.8), 33–87.5 | 78–81 |
| Dystonia plus | Myoclonus dystonia | 10 | 33.9 (18.6) | 25.2 (19.4) | 44.2 (49.6) | 58 (19.2), 47.8–73.9 | 5 16 82–86 |