The prevalence of ASD is unevenly distributed between the genders, with males disproportionately diagnosed with such disorders. There is no concrete explanation for the rise in ASD rates that started in the 1970’s, however genes, environmental factors, and changes in the definition and diagnosis of ASD have all been thought to play a role. had ASD, more than four times the rate of 6.7 per 1,000 for the year 2000. In 2020, it was estimated that 27.6 out of every 1,000 children in the U.S. ![]() Prevalence of autism in the United States
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