Sample size estimates for distinguishing posited reductions in dystonia spread cumulative probability over 2 years by onset site
| Power | Cervical | Blepharospasm | Hand | Laryngeal |
| 50% reduction | ||||
| 80 | 498 (996) | 59 (118) | 293 (586) | 227 (454) |
| 90 | 666 (1332) | 79 (158) | 393 (786) | 303 (606) |
| 30% reduction | ||||
| 80 | 1639 (3278) | 178 (356) | 959 (1918) | 737 (1474) |
| 90 | 2194 (4388) | 238 (476) | 1283 (2566) | 986 (1972) |
Values are shown as size of treated/untreated groups and total sample size in parentheses under assumption of equal allocation across groups.