Epidemiological Surveys of Autism and Other Pervasive Developmental Disorders: An Update

Abstract

This paper was commissioned by the committee on the Effectiveness of Early Education in Autism of the National Research Council (NRC). It provides a review of epidemiological studies of pervasive developmental disorders (PDD) which updates a previously published article (The epidemiology of autism: a review. Psychological Medicine 1999; 29: 769–786). The design, sample characteristics of 32 surveys published between 1966 and 2001 are described. Recent surveys suggest that the rate for all forms of PDDs are around 30/10,000 but more recent surveys suggest that the estimate might be as high as 60/10,000. The rate for Asperger disorder is not well established, and a conservative figure is 2.5/10,000. Childhood disintegrative disorder is extremely rare with a pooled estimate across studies of 0.2/10,000. A detailed discussion of the possible interpretations of trends over time in prevalence rates is provided. There is evidence that changes in case definition and improved awareness explain much of the upward trend of rates in recent decades. However, available epidemiological surveys do not provide an adequate test of the hypothesis of a changing incidence of PDDs.

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Fombonne, E. Epidemiological Surveys of Autism and Other Pervasive Developmental Disorders: An Update. J Autism Dev Disord 33, 365–382 (2003). https://doi.org/10.1023/A:1025054610557

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  • Autism
  • pervasive developmental disorder
  • epidemiology
  • prevalence
  • incidence
  • childhood disintegrative disorder
  • Asperger disorder