Table 1. Demographic and clinical characteristics in patients with PD and ET.
| Characteristics | PD (n=24) | ET (n=25) | Statistics | |
|---|---|---|---|---|
| Z or χ2 | p | |||
| Females | 12 (50) | 14 (56) | 0.177 | 0.674† |
| Age, years | 70.8±7.6 | 57.4±18.2 | −3.055 | 0.002 |
| Education duration, years | 8.3±5.4 | 7.8±5.7 | −0.357 | 0.747 |
| Disease duration, years | 5.1±2.4 | 12.5±8.5 | −3.796 | <0.001 |
| Handedness, right/left or both | 18 (75)/6 (25) | 24 (96)/1 (4) | n.a. | 0.036* |
| Family history, yes/no or uncertain | 4 (16.7)/20 (83.3) | 6 (24)/19 (76) | n.a. | 0.524* |
| UPDRS-III score | 20.3±11.3 | n.a. | n.a. | n.a. |
| Tremor score in both hands at rest | 2.3±1.3 | 0.0±0.2 | −5.753 | <0.001 |
| Resting tremor score in more-affected hand | 1.8±0.8 | 0.1±0.4 | −5.825 | <0.001 |
| Resting tremor score in less-affected hand | 0.6±0.4 | 0.0±0.2 | −3.617 | 0.001 |
| Tremor score in both hands during activity/posture | 1.4±1.4 | 2.4±1.3 | −2.670 | 0.008 |
| Kinetic tremor score in more-affected hand | 0.9±0.8 | 1.5±0.8 | −2.660 | 0.008 |
| Kinetic tremor score in less-affected hand | 0.5±0.7 | 1.0±0.7 | −2.235 | 0.025 |
| Hoehn & Yahr stage | 2.1±0.2 | n.a. | n.a. | n.a. |
Data are mean±standard-deviation or n (%) values. Continuous or ordinal variables were evaluated only using the Mann-Whitney U test with the Z value after testing for normality. For categorical variables. p values were assessed using.
*Fisher's exact test or the †Chi-square test.
ET: essential tremor, n.a.: not applicable, PD: Parkinson's disease, UPDRS-III: Part III of the Unified Parkinson's Disease Rating Scale.