Autism Rates Reach 2.2% Among Four-Year-Olds In 2020

According to surveillance data collected by the Autism and Developmental Disabilities Monitoring (ADDM) Network sites in 11 states, it’s estimated that approximately 2.2% of four-year-old children in the United States have autism (a 62% increase over a four-year span). In 2016, there were 13.4 cases per 1,000 four-year-old children, rising to 17.0 in 2018 and rising again to 21.5 cases in 2020.

The ADDM site prevalence data is used to estimate the overall prevalence across the United States. Across the 11 states, autism prevalence among four-year-olds in . . .