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Table 2 Proportion of patients with tremor and dytonia with and without positive family history (patients with dystonic tremor were considered as having dystonia).

From: Clustering of dystonia in some pedigrees with autosomal dominant essential tremor suggests the existence of a distinct subtype of essential tremor

  Positive family history of tremor Negative family history of tremor
Positive family history of dystonia 98 27
Negative family history of dystonia 365 167