Fewer autistic children meet the new definition of “profound autism”
CDC ADDM Network investigators, JAACAP, 2026
DOI 10.1016/j.jaac.2026.09.019
Analysis of surveillance records, 7,084 autistic 8-year-olds, 13 US sites
Summary: “Profound autism” has been described as autistic people who need around-the-clock support, and an expert group recently agreed on a formal definition. The team applied that new definition, along with several earlier ones, to CDC records for autistic 8-year-olds from 2022. Under the new definition, about 17% met criteria, compared with the CDC’s earlier estimate of about 27%. Rates varied widely by site, from about 10% to 35%. Changing the IQ cutoff or dropping IQ from the definition shifted the estimate substantially in either direction. Only about half the records had complete information, and missing IQ data were probably more common in the children most likely to qualify. That could bias the estimate downward.
Takeaways for clinicians
Prevalence depends heavily on how the definition is written, especially the IQ thresholds.
Assessing IQ in minimally verbal children is hard, and missing scores affect the data.
Worth knowing as the term shows up in policy and service eligibility discussions.
Takeaways for families
The lower number reflects a new definition, not a change in children’s needs.
How autism is defined and measured can change who qualifies for certain labels or services.
