In Iceland, the crude prevalence for all types of primary dystonia was 37.1/105 (confidence interval, 30.4-44.9). Focal dystonia had the highest prevalence (31.2/105), followed by segmental (3.1/105), multifocal (2.4/105) and generalized dystonia (0.3/105). Cervical dystonia was the most common focal dystonia (11.5/105), followed by limb dystonia (8.0/105), laryngeal dystonia (5.9/105), blepharospasm (3.1/105), and oromandibular dystonia (2.8/105). The male:female ratio for all patients was 1:1.9 (P = 0.0007), and females outnumbered males in all subtypes except oromandibular dystonia. Mean age of onset for all patients was 42.7 years (range, 3-82 years). This prevalence of primary dystonia is higher than in most reported studies, possibly because of more complete ascertainment but the relative frequencies of dystonia subtypes is similar.
|Number of pages||6|
|Publication status||Published - Mar 2006|