The prevalence of autism spectrum disorder (ASD) is now one in 54 children based on 2016 data, up from one in 60 in 2014, according to the Autism and Developmental Disabilities Monitoring (ADDM) Network of the federal Centers for Disease Control and Prevention (CDC). The surveillance program estimates ASD prevalence among children aged 8 living in 11 sites. The CDC also found that the prevalence of ASD varied considerably across these sites.
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Alison Knopf (2020) studied this question.