Journal of Autism and Developmental Disorders

, Volume 15, Issue 3, pp 315–321

Familial heterogeneity in infantile autism

  • Teresa Davis Baird
  • Gerald J. August

DOI: 10.1007/BF01531501

Cite this article as:
Baird, T.D. & August, G.J. J Autism Dev Disord (1985) 15: 315. doi:10.1007/BF01531501


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 higherfunctioning autistic sample. These findings suggest that there may be etiological differences in autism, depending on the degree of associated mental retardation.

Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • Teresa Davis Baird
    • 1
  • Gerald J. August
    • 1
  1. 1.University of Texas Medical BranchUSA
  2. 2.Children's Mental Health UnitLeonard Morse HospitalNatick