Journal of Autism and Developmental Disorders

, Volume 43, Issue 1, pp 200–210 | Cite as

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
Original Paper

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.

Keywords

Autism Epidemiology Prevalence Diagnostic criteria Intellectual disability 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Judith S. Miller
    • 1
    • 9
  • Deborah Bilder
    • 1
  • Megan Farley
    • 1
  • Hilary Coon
    • 2
  • Judith Pinborough-Zimmerman
    • 1
  • William Jenson
    • 5
  • Catherine E. Rice
    • 3
  • Eric Fombonne
    • 4
  • Carmen B. Pingree
    • 6
  • Edward Ritvo
    • 7
  • Riva-Ariella Ritvo
    • 8
  • William M. McMahon
    • 2
  1. 1.Department of PsychiatryUniversity of UtahSalt Lake CityUSA
  2. 2.Department of Psychiatry and the Brain InstituteUniversity of UtahSalt Lake CityUSA
  3. 3.Centers for Disease Control and PreventionAtlantaUSA
  4. 4.Department of Psychiatry, Montreal Children’s HospitalMcGill UniversityMontrealCanada
  5. 5.Department of Educational PsychologyUniversity of UtahSalt Lake CityUSA
  6. 6.The Carmen B. Pingree Center for Children with AutismSalt Lake CityUSA
  7. 7.University of California, Los AngelesLos AngelesUSA
  8. 8.Yale University School of MedicineNew HavenUSA
  9. 9.Center for Autism ResearchChildren’s Hospital of PhiladelphiaPhiladelphiaUSA

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