All children were screened at enrolment with the M-CHAT, the Autism Behaviour Checklist (ABC [46]) and the CARS [42]. The ABC is a well-established parent-report checklist used to screen for and diagnose autism. The Gesell Developmental Schedules assess five domains of cognitive abilities: adaptive behaviour, gross motor behaviour, language behaviour, fine motor behaviour and personal-social behaviour [47]. The TD children were screened at enrolment. The average raw scores of three of the domains (adaptive behaviour, gross motor behaviour and fine motor behaviour) were above 80 in both groups; there were group differences in the scores of the other two domains (language behaviour and personal-social behaviour).
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