- Bilateral action tremor of the hands and forearms (but not resting tremor)
- Absence of other neurologic signs, with the exception of cogwheel phenomenon
- With or without tremor in other locations (head, voice, lower limbs)
| - Long duration (>3 years)
- Positive family history
- Beneficial response to alcohol
| - Isolated focal tremors (voice, head)
- Orthostatic tremor with frequency >12 Hz
- Task- and position-specific tremors
- Sudden onset and stepwise deterioration
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