Diagnosis and Epidemiology of Autism Spectrum Disorders

  title={Diagnosis and Epidemiology of Autism Spectrum Disorders},
  author={Lee Tidmarsh and Fred R Volkmar},
  journal={The Canadian Journal of Psychiatry},
  pages={517 - 525}
In this paper, we give an overview of the diagnostic categories of autism and other pervasive developmental disorders (PDDs) and discuss the changes in the DSM classification system over the past 20 years. We describe each subtype of PDD, along with comorbid psychiatric conditions, assessment guidelines, and tools for diagnosis. The epidemiology of autism has generated much discussion and research; we report the most recent data, as well as recent findings about controversial issues purporting… 

Tables from this paper

Screening, identification and evaluation of autism spectrum disorders in primary health care.

  • A. Lakić
  • Psychology, Medicine
    Vojnosanitetski pregled
  • 2012
Differences in the presence and degree of basic clinical characteristics represent the spectrum of autism disorders.

What’s new in autism?

This review on autism spectrum disorder (ASD) focusses on recent insights in the clinical picture, such as continuity of the phenotype and the concept of broader phenotype, on epidemiology and on

Differential Diagnosis of Autism Spectrum Disorder

Differential Diagnosis of Autism Spectrum Disorder describes clinical considerations and best practices related to diagnosing children with autism spectrum disorder (ASD) versus commonly

The Role of the Neurobiologist in Redefining the Diagnosis of Autism

  • E. London
  • Psychology, Medicine
    Brain pathology
  • 2007
It is proposed that a close working relationship between neurobiologists and clinicians is necessary in order to identify etiologically based diagnostic schemas that would complement, rather than replace, the clinical diagnosis of autism.

Examination of Group Differences using the Autism Spectrum Disorders-Diagnostic for Children (ASD-DC)

Marked differences on factors and specific items of ASD were noted across groups and implications of these data for clinical practice are discussed.

Factor Structure of the Autism Spectrum Disorders-Diagnostic for Children (ASD-DC)

This investigation consisted of two studies designed to look at the underlying structure of the Autism Spectrum Disorders-Diagnostic for Children (ASD-DC). Study 1 was a factor analysis of the



The screening and diagnosis of autistic spectrum disorders.

Specific detailed recommendations for each level have been established in this document, which are intended to improve the rate of early suspicion and diagnosis of, and therefore early intervention for, autism.

Depression in Persons with Autism: Implications for Research and Clinical Care

The factors that influence the presence of depression in persons with autism, such as the level of intelligence, age, gender, associated medical conditions, and the role of genetic factors and life events are examined.

The Classification of Autism, Asperger's Syndrome, and Pervasive Developmental Disorder

  • P. Szatmari
  • Psychology
    Canadian journal of psychiatry. Revue canadienne de psychiatrie
  • 2000
The historical development of the classification of PDD is reviewed, recent empirical data on issues of reliability and validity are summarized, and a new approach to classification and understanding is suggested.

Epilepsy in autism

The prevalence of autism.

The findings of a survey that found a rate of 34 per 10000 for autism spectrum disorders (ASDs) among 3to 10-year-old children in metropolitan Atlanta suggest that these differences might reflect new diagnostic criteria for autism and increased availability of developmental disability services for children with autism in the 1990s.

Comorbid association of autism and schizophrenia.

It does not appear that the two conditions are more commonly observed together than would be expected on a chance basis; therefore, the current (DSM-III-R) approach to dual diagnosis of these conditions appears reasonable.

Prevalence of Childhood Disintegrative Disorder

The conclusion is that CDD is very rare and its prevalence is 60 times less than that for autistic disorder, assuming a prevalence of 10 per 10,000 for autism.

Prevalence of childhood disintegrative disorder.

  • E. Fombone
  • Medicine, Psychology
    Autism : the international journal of research and practice
  • 2002
The conclusion is that CDD is very rare and its prevalence is 60 times less than that for autistic disorder, assuming a prevalence of 10 per 10,000 for autism.

Outcome in autism and autistic-like conditions.

  • C. Gillberg
  • Psychology, Medicine
    Journal of the American Academy of Child and Adolescent Psychiatry
  • 1991
Outcome in autistic-like conditions is even more variable, ranging from excellent in many cases ofSo-called Asperger syndrome to gloomy in most cases of so-called disintegrative disorders.

Outcome research in Asperger syndrome and autism.

  • K. Tsatsanis
  • Psychology
    Child and adolescent psychiatric clinics of North America
  • 2003