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Matson, Johnny L.; Hattier, Megan A.; Williams, Lindsey W. – Journal of Autism and Developmental Disorders, 2012
Although it is still unclear what causes autism spectrum disorders (ASDs), over time researchers and clinicians have become more precise with detecting and diagnosing ASD. Many diagnoses, however, are based on the criteria established within the "Diagnostic and Statistical Manual of Mental Disorders" ("DSM"); thus, any change in these diagnostic…
Descriptors: Incidence, Autism, Mental Disorders, Criteria
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Worley, Julie A.; Matson, Johnny L.; Sipes, Megan; Kozlowski, Alison M. – Research in Autism Spectrum Disorders, 2011
The prevalence of autism spectrum disorders (ASD) continues to be a source of debate among researchers and clinicians. Prevalence studies are of the utmost importance in order to obtain an accurate picture of the true prevalence rate of ASD and because these rates continue to be on the rise. To date, studies examining prevalence rates have…
Descriptors: Early Intervention, Incidence, Autism, Toddlers