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Comparison of prevalence estimates (number of cases/1,000 children) based on previous and new case definitions of autism spectrum disorder, by Autism and Developmental Disabilities Monitoring (ADDM) Network site, United States, 2014 and 2016. A) Surveillance year 2014 (8 sites; unweighted Pearson’s r = 0.922); B) surveillance year 2016 (11 sites; unweighted Pearson’s r = 0.942).
