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The prevalence of primary dystonia in the general community

From the University Hospital of Neurology (Drs. Müller, Kiechl, Wenning, Seppi, Willeit, Wissel, and Poewe), Innsbruck, Austria; Department of Neurology (Dr. Gasperi), Bruneck Hospital, Italy; and Department of Neurology (Dr. Gasser), Ludwig-Maximilians University, Munich, Germany.

Address correspondence and reprint requests to Prof. W. Poewe, Department of Neurology, Innsbruck University Hospital, Anichstr. 35, A-6020 Innsbruck, Austria; e-mail: werner.poewe{at}uibk.ac.at

The prevalence of primary dystonia was assessed in a random population sample of individuals aged 50 and over in Bruneck, South Tyrol. The diagnosis of primary dystonia was confirmed by videotaped review. Primary dystonia was present in 6 of 707 cases resulting in a prevalence rate of 732 per 100,000 (95% CI 319–1,564) in the general population aged 50 and over. Only two cases (33%) had been previously diagnosed. These results indicate that the true prevalence of primary dystonia is significantly higher than published rates.

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