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Q How common are autism and autism-related spectrum disorders in children in the South Thames region of the UK?
Prospective cohort study.
Twelve districts, South Thames, UK; time period of assessment not stated.
56 946 children born between 1 July 1990 and 31 December 1991 in South Thames (mean age at assessment 12 years, range 9.8–14.4 years).
Children with an autistic spectrum disorder (ASD) or with social and communicative impairment were identified from the child health and speech and language therapy services registers. Children with a possible undiagnosed ASD (defined as those having a statement of special educational needs) were identified using the special needs register. All 1770 children identified in this survey received the social communication questionnaire (SCQ). In-depth clinical assessment using the autism diagnostic interview-revised (ADI-R), autism diagnostic observation schedule-generic (ADOS-G) plus IQ, language and adaptive behaviour assessment was carried out on a random …
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