Abstract
Background: The Bayley Scales of Development Social-Emotional questionnaire (Bayley-SE,PsychCorp,2006) and the Quantitative Checklist for Autism in Toddlers (Q-CHAT,Allison et al,2008) are newly-developed parent-completed questionnaires providing quantitative measures of early childhood social-communication difficulty. They aim to identify children “at-risk” for autism spectrum disorder (ASD).
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