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

J Autism Dev Disord. 2008 Sep;38(8):1414-25. doi: 10.1007/s10803-007-0509-7. Epub 2008 Feb 1.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Autistic Disorder / diagnosis*
  • Autistic Disorder / psychology
  • Child, Preschool
  • Early Diagnosis
  • Female
  • Humans
  • Infant
  • Male
  • Mass Screening*
  • Personality Assessment / statistics & numerical data*
  • Psychometrics / statistics & numerical data
  • Reproducibility of Results
  • Surveys and Questionnaires