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[Correspondence] CDC autism rate: misplaced reliance on passive sampling?

We welcomed The Lancet’s Editorial (May 5, p 1750)1 about the release of the seventh US Centers for Disease Control and Prevention (CDC) Autism Developmental Disabilities Monitoring Network (ADDM) report.2 This report is based on surveillance of health and education records of samples of more than 300 000 children aged 8 years from 11 US states since 2000. The latest CDC report for 2014 documents a further increase in the prevalence of autism spectrum disorder, from 14·4 per 1000 children in 2012, to 16·8 per 1000 in 2014.

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