Journal of Autism and Developmental Disorders

, Volume 38, Issue 8, pp 1414–1425 | Cite as

The Q-CHAT (Quantitative CHecklist for Autism in Toddlers): A Normally Distributed Quantitative Measure of Autistic Traits at 18–24 Months of Age: Preliminary Report

  • Carrie Allison
  • Simon Baron-Cohen
  • Sally Wheelwright
  • Tony Charman
  • Jennifer Richler
  • Greg Pasco
  • Carol Brayne
Original Paper

Abstract

We report a major revision of the CHecklist for Autism in Toddlers (CHAT). This quantitative CHAT (Q-CHAT) contains 25 items, scored on a 5 point scale (0–4). The Q-CHAT was completed by parents of n = 779 unselected toddlers (mean age 21 months) and n = 160 toddlers and preschoolers (mean age 44 months) with an Autism Spectrum Condition (ASC). The ASC group (mean (SD) = 51.8 (14.3)) scored higher on the Q-CHAT than controls (26.7 (7.8)). Boys in the control group (27.5 (7.8)) scored higher than girls (25.8 (7.7)). The intraclass correlation for test-retest reliability was 0.82 (n = 330). The distribution in the control group was close to normal. Full examination of the clinical validity of the Q-CHAT and test properties is underway.

Keywords

Autism spectrum conditions Q-CHAT Childhood screening 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Carrie Allison
    • 1
  • Simon Baron-Cohen
    • 1
  • Sally Wheelwright
    • 1
  • Tony Charman
    • 2
  • Jennifer Richler
    • 1
    • 3
  • Greg Pasco
    • 1
  • Carol Brayne
    • 4
  1. 1.Autism Research Centre, Department of PsychiatryUniversity of CambridgeCambridgeUK
  2. 2.UCL Institute of Child HealthLondonUK
  3. 3.Institute of Child DevelopmentUniversity of MinnesotaMinneapolisUSA
  4. 4.Department of Public Health and Primary CareUniversity of CambridgeCambridgeUK

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