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

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

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

ISSN: 1471-2377