Demographic and clinical features according to Consensus Axis 1 definitions
| Control | ET-0 | ET+1 | ET+2 | P value | |
| Number | 20 | 6 | 5 | 8 | – |
| M:F | 9:11 | 3:3 | 1:4 | 6:2 | – |
| Age | 64.3±12.0 | 62.8±16.5 | 61.4±11.6 | 74.0±8.5 | 0.191* |
| Age at tremor onset | – | 37.7±18.5 | 51.2±13.1 | 46.3±22.4 | 0.505* |
| Tremor duration | – | 25.2±23.2 | 10.2±5.8 | 26.4±19.7 | 0.300* |
| FTM score | – | 16.0±9.2 | 20.4±3.8 | 39.8±13.1 | 0.001* |
| MDS-UPDRS-III 3.4–3.8 | – | 1.0±1.6 | 2.5±4.8 | 4.4±4.0 | 0.063† |
| MoCA | – | 25.8±4.2 | 25.2±3.3 | 24.5±3.6 | 0.80* |
Values shown as mean±SD.
*By one-way analysis of variance.
†By Kruskal-Wallis.
FTM, Fahn-Tolosa-Marin Tremor Rating Scale; MDS-UPDRS-III, Movement Disorder Society-Unified Parkinson’s Disease Rating Scale Part III; MoCA, Montreal Cognitive Assessment.