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. Author manuscript; available in PMC: 2016 Mar 7.
Published in final edited form as: Mov Disord. 2015 Jun 22;30(10):1327–1334. doi: 10.1002/mds.26265

FIG. 3.

FIG. 3

Hypothetical model of the prevalence of tremor in the community. Essential tremor (ET) is more prevalent at younger age, and hereditary ET reaches complete penetrance in the 7th decade, but the observed tremor prevalence continuously increases. The group responsible for this growth is hypothetically assumed to represent the aging-related tremor, which increases until late life. The observed tremor prevalence was calculated based on data from Louis and Ferreira22 (Supplemental Data Fig. C). The prevalence of hereditary and sporadic ET is estimated from epidemiologic studies. The aging-related tremor curve is calculated by subtracting hereditary and sporadic ET cases from the observed tremor prevalence.