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New Study Reveals a Major Shift Behind Rising ADHD and Autism Diagnoses (opens in a new tab)

scitechdaily.com · 2026-09-20

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3 supported
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The story

New Study Reveals a Major Shift Behind Rising ADHD and Autism Diagnoses

scitechdaily.com · 2026-09-20

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Every claim we could check holds up. Three of five claims match the study. This overall rating is based only on the claims we could check. Two claims the study doesn't address.

3 supported
2 not covered

Open claim evidence

The source study

Changes in Characteristics Associated With ADHD and ASD Diagnoses Over Time

JAMA Psychiatry · 2026

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5 claims in this story

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Claim 1 of 5Not coveredThe researchers suggest that greater awareness, better identification by healthcare and educational services, broader access to assessments, or a shift in the threshold for diagnosis may help explain the changing population, but the study could not determine how much each factor contributed.View evidenceHide evidence

Why this verdict

The abstract-level profile supports the broad interpretation that changing diagnostic practices or health-care capacity may explain rising diagnostic rates rather than changes in underlying risk alone. However, the specific list in the story—greater awareness, better identification by health-care and educational services, broader access to assessments, or a shift in diagnostic threshold—and the statement that the study could not determine each factor’s contribution are not fully verifiable from the supplied abstract-level profile.

Study evidence

Overall attenuation of associations between prediagnostic characteristics and ADHD/ASD diagnoses from 2012 to 2022, with ORs moving toward the null, particularly for socioeconomic and perinatal factors.

“This population-based matched case-control study was conducted using nationwide Danish registry data”

Study evidence

Cases (ADHD or ASD diagnosed before age 18) differed from matched controls across all 19 prediagnostic characteristics, but the magnitude of differences diminished over the 2012–2022 period.

“Individuals diagnosed with ADHD or ASD differed from controls across all characteristics, but differences diminished over time”

Claim 2 of 5Not coveredThe findings may help explain why some recent studies have reported better outcomes among people with these diagnoses, because those improvements could partly reflect changes in the population being studied rather than changes in the conditions themselves.View evidenceHide evidence

Why this verdict

The supplied abstract-level profile includes the caution that the findings should not be interpreted as ADHD or ASD becoming less impairing at the individual level, but it does not verify the story’s broader claim about explaining why some recent studies have reported better outcomes among diagnosed people. That interpretive link may be in the full paper, but it is not established at this evidence depth.

Claim 3 of 5SupportedAs ADHD and autism diagnoses rise in Denmark, the children and adolescents receiving them increasingly resemble the broader population in their birth histories, family backgrounds, and other measured characteristics.View evidenceHide evidence

Why this verdict

The abstract-level profile supports the central finding that Danish children/adolescents diagnosed with ADHD or ASD from 2012-2022 became more similar to matched peers without these diagnoses across measured prediagnostic characteristics, including family/parental, perinatal/birth, and health-care-use factors. The claim is associational and does not assert causation.

Study evidence

“This population-based matched case-control study was conducted using nationwide Danish registry data”

Study evidence

Cases (ADHD or ASD diagnosed before age 18) differed from matched controls across all 19 prediagnostic characteristics, but the magnitude of differences diminished over the 2012–2022 period.

“Individuals diagnosed with ADHD or ASD differed from controls across all characteristics, but differences diminished over time”

Claim 4 of 5SupportedThe study found that several characteristics historically more common among young people with these diagnoses became less distinctive between 2012 and 2022.View evidenceHide evidence

Why this verdict

The paper profile states that cases differed from controls across all 19 prediagnostic characteristics, but that these differences diminished over time, with odds ratios attenuating toward the null. This matches the story’s statement that historically distinctive characteristics became less distinctive between 2012 and 2022.

Study evidence

“This population-based matched case-control study was conducted using nationwide Danish registry data”

Study evidence

Cases (ADHD or ASD diagnosed before age 18) differed from matched controls across all 19 prediagnostic characteristics, but the magnitude of differences diminished over the 2012–2022 period.

“Individuals diagnosed with ADHD or ASD differed from controls across all characteristics, but differences diminished over time”

Claim 5 of 5SupportedAmong the measured differences, low birth weight showed a weaker association over time with later ADHD or ASD diagnosis, falling from 54% more likely at the beginning of the study period to 17% more likely by the end.View evidenceHide evidence

As stated54% more likely; 17% more likely

Why this verdict

The abstract reports that the low-birth-weight association weakened from OR 1.54 in 2012-2013 to OR 1.17 in 2020-2022, corresponding to 54% and 17% higher odds if expressed as percent above 1. The story accurately presents this as a weakening association with later ADHD or ASD diagnosis, though the precise paper metric is odds ratio rather than direct risk or probability.

Study evidence

“This population-based matched case-control study was conducted using nationwide Danish registry data”

Study evidence

Cases (ADHD or ASD diagnosed before age 18) differed from matched controls across all 19 prediagnostic characteristics, but the magnitude of differences diminished over the 2012–2022 period.

“Individuals diagnosed with ADHD or ASD differed from controls across all characteristics, but differences diminished over time”

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Context layer

What the story left out

Important study details the story did not include.

Primary study design: a population-based matched case-control study using nationwide Danish registry data, with ADHD/ASD cases diagnosed before age 18 during 2012-2022 matched 1:10 to controls.
The story reflects that the study was Danish and concerned children/adolescents diagnosed between 2012 and 2022, but the supplied presentation does not state the matched case-control registry design, which is important for interpreting the odds-ratio associations.
From Population-based matched case-control study (1:10 matching)
Secondary heterogeneity findings: attenuation was greater for ADHD than ASD, more pronounced for diagnoses at ages 10-17 than younger ages, similar across sexes, and similar in higher-diagnostic-certainty analyses.
These subgroup and sensitivity findings are material secondary results in the paper profile, but they are not included in the supplied story presentation.
From Matched case-control with stratified subgroup analyses and sensitivity restriction to higher diagnostic certainty

4 things the story did carry across

Main finding: associations between 19 prediagnostic characteristics and later ADHD/ASD diagnosis attenuated over time, meaning diagnosed children/adolescents became more similar to peers without these diagnoses on measured characteristics.
Illustrative quantitative result: low birth weight OR decreased from 1.54 in 2012-2013 to 1.17 in 2020-2022.
Interpretive caveat: the findings should not be read as evidence that ADHD or ASD have become less impairing at the individual level.
Generalizability caveat: the evidence is from Danish nationwide registries and diagnoses before age 18 in the 2012-2022 diagnosis window.

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study summary

Lead result

secondary data

1Lead resultsecondary dataEstimate how associations between 19 prediagnostic characteristics (“risk factors”) and subsequent ADHD or ASD diagnoses change over calendar time (year of diagnosis) in a Danish nationwide birth cohort, using matched case-control analyses.Population-based matched case-control study (1:10 matching)Expand

In plain English

Population-based matched case-control analysis of nationwide Danish registry data (births 1994–2022, follow-up to age 18) estimating how associations between 19 prediagnostic characteristics and subsequent ADHD or ASD diagnoses changed across calendar time (diagnoses 2012–2022). Year-specific odds ratios were estimated using conditional logistic regression in a 1:10 matched design.

Key findings

Overall attenuation of associations between prediagnostic characteristics and ADHD/ASD diagnoses from 2012 to 2022, with ORs moving toward the null, particularly for socioeconomic and perinatal factors.
Low birth weight: association with subsequent ADHD/ASD diagnosis weakened over time (OR 1.54 [95% CI, 1.41–1.68] in 2012–2013 to OR 1.17 [95% CI, 1.10–1.24] in 2020–2022).OR 1.54 (95% CI 1.41–1.68) in 2012–2013; OR 1.17 (95% CI 1.10–1.24) in 2020–2022

“This population-based matched case-control study was conducted using nationwide Danish registry data”

2secondary dataCompare whether attenuation of associations over time differs between ADHD vs ASD and across key strata (age at diagnosis bands, sex) and under higher diagnostic certainty restrictions.Matched case-control with stratified subgroup analyses and sensitivity restriction to higher diagnostic certaintyExpand

In plain English

In a nationwide matched case-control analysis of Danish registry data (cases diagnosed 2012–2022), temporal attenuation of associations between prediagnostic characteristics and diagnosis was larger for ADHD than for ASD, was more pronounced for diagnoses at ages 10–17 years than at younger ages, and showed similar patterns across sexes and in analyses restricted to cases with higher diagnostic certainty. Example effect: mean yearly change in OR for household income was 6.5% (95% CI, 5.7% to 7.3%) for ADHD versus 0.7% (95% CI, -0.1% to 1.5%) for ASD.

Key findings

Attenuation of associations between prediagnostic characteristics and diagnosis over time was greater for ADHD than for ASD.Mean yearly change in OR for household income: 6.5% (95% CI, 5.7% to 7.3%) for ADHD; 0.7% (95% CI, -0.1% to 1.5%) for ASD.
Attenuation over time was more pronounced among individuals diagnosed at ages 10–17 years than among those diagnosed at younger ages.

“Attenuation was greater for ADHD than ASD”

What this piece can’t prove

The abstract does not provide comprehensive strata-specific effect estimates or numeric results for most subgroup comparisons (beyond the household income example and the low birth weight overall example).

2 further details could not be confirmed from the summary.

3secondary dataQuantify descriptive case/control differences across all 19 prediagnostic characteristics in the registry-linked sample to contextualize temporal trend findings.Registry-based matched case-control descriptive comparisonsExpand

In plain English

Descriptive comparison of 71,317 cases diagnosed with ADHD or ASD between 2012–2022 and 713,170 matched controls across 19 prediagnostic characteristics, reporting that cases differed from controls on all characteristics but that these differences attenuated over time (illustrated by period-specific ORs).

Key findings

Cases (ADHD or ASD diagnosed before age 18) differed from matched controls across all 19 prediagnostic characteristics, but the magnitude of differences diminished over the 2012–2022 period.
Example illustrating attenuation: the OR for low birth weight (case vs control) decreased from 1.54 (95% CI, 1.41 to 1.68) in 2012–2013 to 1.17 (95% CI, 1.10 to 1.24) in 2020–2022.OR 1.54 (95% CI, 1.41–1.68) in 2012–2013 → OR 1.17 (95% CI, 1.10–1.24) in 2020–2022