On April 12, the Centers for Disease
Control and Prevention (CDC) released its Morbidity
and Mortality Weekly Report (MMWR) which included a study of data from
2010, 2012, and 2014 on the prevalence of autism among four-year-old children
across study sites in seven states. The data indicate that the prevalence rate
was 1 in 59. However, prevalence rates varied greatly between study sites. Of
the three states that had data for all three years, only one (New Jersey) had
an increase, while the rates in the other two (Missouri and Arizona) remained
stable. These three sites also reported no improvement in age at first
evaluation. These study sites were part of the Early Autism and Developmental
Disabilities Monitoring (ADDM), a subset of the broader ADDM, which primarily
monitors autism prevalence among eight-year-old children.
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