Clinical features | Parkinson disease tremor | Essential tremor |
Age at onset | >50 years | Bimodal 2nd and 6th decade |
Sex | Male ≥ Female | Male = Female |
Family history | ~10 to 15 percent | ~50 percent |
Asymmetry | +++ | + |
Frequency | 4 to 6 Hz | 6 to 12 Hz |
Character | At rest | Postural, kinetic |
Supination-pronation | Flexion-extension | |
Distribution | Hands, legs, chin, tongue | Hands, head, voice |
Associated features | Bradykinesia, rigidity, postural instability, micrographia | Mild gait disorder or cerebellar signs in a minority |
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