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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 …
For correspondence: Professor Gillian Baird, Newcomen Centre, Guy’s Hospital, London, UK;
Sources of funding: Wellcome Trust and Department of Health, UK.