A large, registry‑based Danish cohort study finds that shifts in diagnostic criteria and the addition of outpatient reporting explain roughly 60% of the increased measured prevalence of autism spectrum disorders in children born 1980–1991. The study quantifies the separate contributions: ~33% from diagnostic‑criteria change, ~42% from adding outpatient contacts, and ~60% combined (with confidence intervals).
— If reporting reforms drive most of the observed autism increase, policy debates and resource planning should focus on diagnostic practice, surveillance methods, and service demand rather than assuming a large new environmental cause.
2026.04.04
90% relevant
The article advances the same core claim: much of the observed increase in autism prevalence reflects changing definitions, diagnostic incentives (DSM‑III and later), registry and cohort biases (California Department of Developmental Services data), and survivorship effects rather than a pure biological rise; it names RFK Jr. and the HHS priority as the policy actor linking the debate to governance choices.
2026.04.04
85% relevant
This review directly addresses the DSM‑5 consolidation of pervasive developmental disorders into a single autism spectrum disorder and examines whether diagnostic boundary changes will alter prevalence — connecting to the claim that shifts in reporting/diagnostic rules explain much of the observed increase in autism rates.
2025.05.27
60% relevant
The ADDM data show heterogeneous site ranges and a long upward trend, which ties to the idea that changes in surveillance, diagnosis, and reporting practices likely contribute to observed prevalence increases; the CDC's methods and site variation are the concrete evidence linking the data to that interpretation.
2020.04.04
90% relevant
The article's twin‑design analysis of Swedish registries and cohort questionnaires finds very high and stable heritability of ASD across birth cohorts (e.g., heritability 0.88–0.97), directly supporting the claim that changes in diagnosis, reporting, or ascertainment (not new environmental risks) explain much of the observed increase in autism diagnoses.
2015.01.04
100% relevant
Danish national health registries: 1994 diagnostic‑criteria change and 1995 inclusion of outpatient diagnoses produced modeled attributable fractions (33%, 42%, 60%).
2009.10.04
80% relevant
This paper provides concrete evidence that diagnostic and reporting changes materially increased autism caseloads in California (using 7003 records from the California Department of Developmental Services, 1992–2005) and estimates that about 26% of the observed rise is attributable to diagnostic change via one pathway (those previously diagnosed with intellectual disability). That empirical finding directly supports the broader claim that changes in surveillance and classification explain a large share of autism prevalence increases.