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Epidemiology of pervasive developmental disorders
1Department of Psychiatry, Montreal Children's Hospital of the McGill University Health Centre, Montreal, Quebec, Canada. eric.fombonne@mcgill.ca
Pediatric Research
|February 17, 2009
Summary
Pervasive developmental disorders (PDDs) affect approximately 60-70 per 10,000 children. Increased prevalence is linked to broader diagnostic criteria and greater awareness.
Area of Science:
- Neuroscience
- Developmental Psychology
- Epidemiology
Background:
- Pervasive Developmental Disorders (PDDs) encompass a range of neurodevelopmental conditions.
- Estimates for PDD prevalence have varied historically.
- Understanding current prevalence is crucial for resource allocation and intervention.
Purpose of the Study:
- To review and synthesize prevalence estimates for PDDs from studies published since 1966.
- To analyze trends in PDD prevalence over recent decades.
- To explore factors contributing to observed changes in prevalence.
Main Methods:
- Systematic review of 43 studies.
- Analysis of prevalence data for autistic disorder, Asperger disorder, PDD not otherwise specified, and childhood disintegrative disorder.
- Examination of trends and potential contributing factors to prevalence changes.
Main Results:
- Autistic disorder prevalence is estimated at approximately 20/10,000.
- PDD not otherwise specified prevalence is around 30/10,000.
- Asperger disorder is less common, and childhood disintegrative disorder is rare (approx. 2/100,000).
- Combined PDD prevalence is consistently estimated between 60-70/10,000.
- Recent increases in prevalence are noted.
Conclusions:
- PDDs are among the most frequent childhood neurodevelopmental disorders.
- Broadening diagnostic concepts, expanded criteria, improved services, and increased awareness likely explain prevalence increases.
- Other contributing factors cannot be entirely excluded.
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