Researchers in 1987 in North Dakota “conducted in-person assessments of the entire population of 180,000 children under 18” in an “exhaustive” study of autism prevalence.

Sources and attribution

1. [S1] FactCheck.org original review

   Original review · Retrieved October 16, 2026

Original review: FactCheck.org. Structured data compiled by Data Commons under CC BY 4.0. Publisher article content is subject to its own terms.

Updated October 16, 2026