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. 1985 Sep;15(3):315-21.
doi: 10.1007/BF01531501.

Familial heterogeneity in infantile autism

T D Baird, G J August

Familial heterogeneity in infantile autism

T D Baird et al. J Autism Dev Disord. 1985 Sep.

Abstract

The incidence of autism and cognitive disability was assessed in the biological siblings of 29 autistic probands subdivided on the basis of IQ. A significant clustering of autism and nonspecific intellectual retardation was found in the siblings of severely retarded autistic probands which was not present in the siblings of our higher-functioning autistic sample. These findings suggest that there may be etiological differences in autism, depending on the degree of associated mental retardation.

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