Autism spectrum disorder reclassified: A second look at the 1980s utah/ucla autism epidemiologic study

Judith S. Miller, Deborah Bilder, Megan Farley, Hilary Coon, Judith Pinborough-Zimmerman, William Jenson, Catherine E. Rice, Eric Fombonne, Carmen B. Pingree, Edward Ritvo, Riva Ariella Ritvo, William M. McMahon

Research output: Contribution to journalArticle

27 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)200-210
Number of pages11
JournalJournal of autism and developmental disorders
Volume43
Issue number1
DOIs
StatePublished - Jan 1 2013

Keywords

  • Autism
  • Diagnostic criteria
  • Epidemiology
  • Intellectual disability
  • Prevalence

ASJC Scopus subject areas

  • Developmental and Educational Psychology

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    Miller, J. S., Bilder, D., Farley, M., Coon, H., Pinborough-Zimmerman, J., Jenson, W., Rice, C. E., Fombonne, E., Pingree, C. B., Ritvo, E., Ritvo, R. A., & McMahon, W. M. (2013). Autism spectrum disorder reclassified: A second look at the 1980s utah/ucla autism epidemiologic study. Journal of autism and developmental disorders, 43(1), 200-210. https://doi.org/10.1007/s10803-012-1566-0