Autism spectrum disorder reclassified: a second look at the 1980s Utah/UCLA Autism Epidemiologic Study.

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TitleAutism spectrum disorder reclassified: a second look at the 1980s Utah/UCLA Autism Epidemiologic Study.
Publication TypeJournal Article
Year of Publication2013
AuthorsMiller, JS, Bilder, D, Farley, M, Coon, H, Pinborough-Zimmerman, J, Jenson, W, Rice, CE, Fombonne, E, Pingree, CB, Ritvo, E, Ritvo, R-A, McMahon, WM
JournalJ Autism Dev Disord
Volume43
Issue1
Pagination200-10
Date Published2013 Jan
ISSN1573-3432
KeywordsAdolescent, Adult, Child, Child Development Disorders, Pervasive, Child, Preschool, Diagnostic and Statistical Manual of Mental Disorders, Female, Humans, Intellectual Disability, Intelligence, Intelligence Tests, Male, Prevalence, Young Adult
Abstract

The purpose of the present study was to re-examine diagnostic data from a state-wide autism prevalence study (n = 489) conducted in the 1980s to investigate the impact of broader diagnostic criteria on autism spectrum disorder (ASD) case status. Sixty-four (59 %) of the 108 originally "Diagnosed Not Autistic" met the current ASD case definition. The average IQ estimate in the newly identified group (IQ = 35.58; SD = 23.01) was significantly lower than in the original group (IQ = 56.19 SD = 21.21; t = 5.75; p < .0001). Today's diagnostic criteria applied to participants ascertained in the 1980s identified more cases of autism with intellectual disability. The current analysis puts this historic work into context and highlights differences in ascertainment between epidemiological studies performed decades ago and those of today.

DOI10.1007/s10803-012-1566-0
Alternate JournalJ Autism Dev Disord
PubMed ID22696195
PubMed Central IDPMC4467195
Grant ListCC999999 / / Intramural CDC HHS / United States