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[!summary]Autism diagnoses have risen dramatically over time, from 0.001% in 1931 to 1.2% in 2021. However, this increase may be largely due to changes in diagnostic criteria and greater awareness rather than a true rise in autism prevalence. Many researchers believe that changes in how autism is diagnosed and reported explain much of the apparent growth in autism rates.
Highlights
id938897047
The earliest data on autism rates is severely biased and greatly underestimates the prevalence of autism. In fact, all intertemporal comparisons of autism rates are biased for a simple but important reason: the definition of autism has changed!