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CHRISTOPHER GILLBERG Department of Child and Youth Psychiatry, University of Gothenburg, Sweden INTRODUCTION childhood are rare (Wing, 1980), which is certainly one of the reasons for the comparative lack of total population reports on epidemiology. The studies by Lotter (1966) in the former county of Middlesex, England, and Brask (1967) in Aarhus, Denmark, in which total or almost total populations were screened, yielded fairly consonant results, prevalence figures for 'autism' of 4-5 per 10,000 children being reported from both investigations. A recent study by Wing and Gould (1979) from a London borough gave closely comparable results, the prevalence rate amounting to 4.9 per 10,000, with 'nuclear autism' cases accounting for 2.0 per 10,000. Although the prevalence reported in these epidemiological studies is in good agreement, there has been some variation as regards the delineation of the syndrome of infantile autism. According to Rutter (1978) it is characterized by early-onset (before 30 months of age) severe disturbances of (a) social relationships, (b) speechlanguage and (c) behaviour with stereotyped mannerisms and/or insistence on sameness. The Lotter (1966) and Wing and Gould (1979) studies used an operational cut-off age for 'early infantile autism' of 5 yr. It is commonly agreed that
The Journal of Child Psychology and Psychiatry – Wiley
Published: Jan 1, 1984
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