- For the first time among 8-year-old children, the prevalence of ASD was lower among white children than among other racial and ethnic groups, reversing the direction of racial and ethnic differences in ASD prevalence observed in the past.
- Black 8-year-old children with ASD were more likely than white children with ASD to have a co-occurring intellectual disability.
- Over the past two decades, ASD prevalence estimates of 8-year-old children from the ADDM Network have increased sharply, from 0.6% in 2000 to 2.2% 2018.
- Among 4-year-olds, ASD prevalence in 2020 ranged from 1.2% of children in Utah to 4.6% in California, with an overall prevalence of 2.1%.
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