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. 1981 Jul;70(4):441-4.
doi: 10.1111/j.1651-2227.1981.tb05720.x.

Mild mental retardation in Swedish school children. I. Prevalence

B Hagberg, G Hagberg, A Lewerth, U Lindberg

Mild mental retardation in Swedish school children. I. Prevalence

B Hagberg et al. Acta Paediatr Scand. 1981 Jul.

Abstract

In an unselected series of Swedish school children born 1966-70, the prevalence of mild mental retardation, defined as an IQ of 50-70, was determined. A prevalence of 0.4% was revealed. The findings in this study, supported by recent IQ analyses in other Scandinavian countries, indicate that a true prevalence for the IQ range 50-70 was ascertained. The high average social standard and early social stimulation are put forth as a likely explanation for the low prevalence of mild mental retardation in Swedish preschool and school children.

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