Pj. Morrison et Nc. Nevin, HUNTINGTON DISEASE IN COUNTY DONEGAL - EPIDEMIOLOGIC TRENDS OVER 4 DECADES, Ulster medical journal, 62(2), 1993, pp. 141-144
The prevalence rate of Huntington disease in County Donegal between 19
61 and 1991 showed a decrease from 4.4 to 1.6 per 100,000 population.
Emigration and reduction in family size probably account for the progr
essive decline in prevalence. Over the same time period in the rest of
Europe, prevalence has declined only gradually, or has remained stati
c.