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We read with interest the January edition of Archives containing three thought-provoking articles on the autistic spectrum. The article by Harrison et al,1 which described the two source “capture recapture” technique as a means of determining “true” prevalence, provided an enlightened alternative to using conventional, “passive” ascertainment of point prevalence. We conducted an 18-month retrospective audit of our social communication clinic for children in Enfield. The primary aim was to compare our clinic with the recommendations set by the National Autism Plan2; however, it also raised issues on:
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the difficulties in obtaining accurate prevalence and incidence estimates; and
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the effect of changes in child health surveillance policy.
Cases were identified from the Enfield social communication clinic referral dataset for the referral period January …
Footnotes
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Competing interests: None.