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Autism in Northern Finland.
M Kielinen1, S L Linna, I Moilanen
1Department of Pediatrics, Clinic of Child Psychiatry, University of Oulu, Finland.
European Child & Adolescent Psychiatry
|November 30, 2000
Summary
Autism spectrum disorder prevalence is higher than previously thought, particularly in 5-7 year olds. This study highlights varying degrees of autism and IQ levels within diagnosed cases.
Area of Science:
- Neurodevelopmental Disorders
- Pediatric Psychiatry
- Clinical Psychology
Background:
- Increasing awareness and refined diagnostic criteria (ICD-10, DSM-IV) for autism spectrum disorders (ASDs).
- Previous estimates of ASD prevalence may have underestimated the actual occurrence.
Purpose of the Study:
- To determine the age-specific incidence and prevalence of ASDs using current diagnostic criteria.
- To characterize the intellectual functioning and severity of autism in the studied population.
Main Methods:
- Utilized ICD-10 and DSM-IV criteria for diagnosis of autism spectrum disorders.
- Assessed age-specific incidence across different pediatric age groups.
- Evaluated intellectual quotient (IQ) and autism severity using the Childhood Autism Rating Scale (CARS).
Main Results:
- Highest cumulative incidence of ASDs observed in 5-7 year olds (20.7 per 10,000).
- Lowest cumulative incidence found in 15-18 year olds (6.1 per 10,000).
- Approximately 50% of cases had an IQ above 70; severity ranged from mild (8.5%) to severe (33.0%).
Conclusions:
- Autism spectrum disorder prevalence appears higher than previously estimated, with significant variation by age.
- A substantial proportion of individuals with ASD have IQs above 70, indicating a need for tailored support.
- The study underscores the importance of updated diagnostic criteria and comprehensive assessment for understanding ASDs.