The Epidemiology of Severe Mental Retardation in Sweden
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To facilitate comparative studies in future epidemiological research, a summary of the available epidemiological and etiological data on severely mentally retarded children from some demographically different areas in Sweden (Gustavson, Hagberg, Hagberg, & Sars, 1977a, b; Gustavson, Holmgren, Jonsell, & Bromquist, 1977c) may be of interest. The children concerned were born in the period 1959-1970, that is, just before the gradual introduction in Sweden of prenatal diagnosis and other measures to prevent congenital disorders and during a period when there was a decrease in perinatal mortality.
[1] G. Hagberg,et al. SEVERE MENTAL RETARDATION IN A SWEDISH COUNTY I. Epidemiology, Gestational Age, Birth Weight and Associated CNS Handicaps in Children Born 1959–70 , 1977, Acta paediatrica Scandinavica.
[2] M. Mikkelsen,et al. Paternal age effect in Down's syndrome , 1977, Annals of human genetics.