Table 1.
Pretreatment comparison of perceptual and acoustic parameters between patients with dystonic and essential tremors.
| Overall level of change | Dystonic tremor | Essential tremor |
| N | 10 | 5 |
| Mean | 78.0 | 92.0 |
| SD | 15.5 | 8.4 |
| P value | 0.097 | |
| Instability | Dystonic tremor | Essential tremor |
| Mean | 79.5 | 90.0 |
| SD | 13.8 | 12.2 |
| P value | 0.130 | |
| Jitter | Dystonic tremor | Essential tremor |
| Mean | 3.17 | 4.76 |
| SD | 4.65 | 4.69 |
| P value | 0.806 | |
| Shimmer | Dystonic tremor | Essential tremor |
| Mean | 21.26 | 24.56 |
| SD | 14.08 | 14.69 |
| P value | 0.624 | |
| Variability of F0 | Dystonic tremor | Essential tremor |
| Mean | 11.00 | 11.60 |
| SD | 4.78 | 4.98 |
| P value | 0.901 | |
N, number of participants; SD, standard deviation; F0, fundamental frequency.