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Study suggests profile of people diagnosed with ADHD and autism has changed over the past decade (opens in a new tab)

medicalxpress.com · 2026-09-12

Short answerEvidenceSource

Short answer

Mixed

Mixed.

The claims we could check match the study, but some claims were not covered by the evidence reviewed.

  • 4 supported
  • 2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
1
2

NewsLink checks it

Mixed

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

  • 4 supported
  • 2 not covered
Open claim evidence
3
Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

6 claims in this story

Showing all 6 claimsChoose a verdict to focus the list.

Claim 1 of 6Not coveredThe authors say the change may reflect greater awareness, improved identification by health care and educational services, broader access to diagnostic assessment, or a shift in the threshold for what is considered clinically impairing, but the study cannot determine the relative contribution of these factors.View evidenceHide evidence

Why this verdict

The abstract-level profile supports broad interpretation in terms of possible changes in diagnostic practices or health-care capacity, but it does not verify the more specific list of mechanisms—greater awareness, educational-service identification, broader diagnostic access, or changing impairment thresholds—or the stated inability to determine their relative contributions.

1

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”
Claim 2 of 6Not coveredThe article says the study may have implications for interpreting ADHD and ASD prevalence trends, planning services, and understanding whether reported outcome improvements partly reflect changes in the diagnosed population rather than changes in prognosis.View evidenceHide evidence

Why this verdict

The abstract-level profile supports implications for interpreting rising ADHD/ASD diagnostic rates, but it does not verify the broader asserted implications for service planning or for interpreting outcome/prognosis improvements. Those points may require full-text evidence beyond the supplied abstract profile.

1

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”
Claim 3 of 6SupportedA study led by the Barcelona Institute for Global Health and Aarhus University found that children and adolescents diagnosed with ADHD or autism spectrum disorder in Denmark today share more characteristics with the general population than those diagnosed a decade ago.View evidenceHide evidence

Why this verdict

The abstract-level profile supports the central finding that, from 2012 to 2022, Danish children and adolescents diagnosed with ADHD or ASD became increasingly similar to peers without these diagnoses on measured prediagnostic characteristics. The profile does not itself verify the institutional leadership detail, but the scientific finding as framed is supported.

1

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”
2

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 6SupportedThe findings suggest that the rise in diagnoses over the past decade may reflect changes in the characteristics of people receiving these diagnoses, in addition to possible changes in the underlying risk of developing ADHD or ASD.View evidenceHide evidence

Why this verdict

The paper profile states that the authors interpret the temporal attenuation as suggesting rising diagnostic rates may reflect changes in diagnostic practices or health-care capacity rather than changes in underlying risk alone. The story’s wording is hedged and speculative, matching the abstract-level discussion.

1

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”
Claim 5 of 6SupportedThe researchers analyzed data from more than 2.1 million children and adolescents in Denmark, comparing more than 71,000 people diagnosed with ADHD or ASD between 2012 and 2022 with more than 713,000 peers without these diagnoses.View evidenceHide evidence

As statedmore than 2.1 million; more than 71,000; more than 713,000

Why this verdict

The reported sample sizes match the profile: 2,194,951 children/adolescents in the registry, 71,317 cases diagnosed between 2012 and 2022, and 713,170 matched controls.

1

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”
2

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 6 of 6SupportedDifferences between diagnosed individuals and their peers became progressively smaller over the study period, including a fall in the low-birth-weight association from 54% more likely to receive a later ADHD or ASD diagnosis a decade ago to 17% by the end of the study period; similar reductions were seen for preterm birth and several socioeconomic indicators.View evidenceHide evidence

As stated54% to 17%

Why this verdict

The profile supports progressive attenuation of case-control differences over time, especially for socioeconomic and perinatal factors. The low-birth-weight example matches the abstract’s OR decrease from 1.54 in 2012–2013 to 1.17 in 2020–2022, corresponding to 54% and 17% higher odds. The story’s 'more likely' wording is less precise than the paper’s odds-ratio metric, but the claim is framed as an association and is materially aligned with the abstract.

1

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”
2

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”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Population-based Danish registry matched case-control design with 1:10 matching and conditional logistic regression estimating odds ratios by year of diagnosis.

    The story mentions nationwide Danish data and comparisons with peers, but it does not clearly convey the matched case-control design, matching variables, conditional logistic regression, or that estimates are odds ratios rather than direct risks.

    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 years, similar across sexes, and similar in higher-diagnostic-certainty analyses.

    These are material secondary findings in the abstract profile, but the story does not report them.

    From Matched case-control with stratified subgroup analyses and sensitivity restriction to higher diagnostic certainty

6 things the story did carry across
  • Main finding: associations between 19 prediagnostic characteristics and later ADHD/ASD diagnosis attenuated from 2012 to 2022, with diagnosed children/adolescents becoming more similar to controls.
  • Sample and time window: 2,194,951 children/adolescents in the registry; 71,317 cases diagnosed between 2012 and 2022; 713,170 matched controls; diagnoses before age 18.
  • Illustrative low-birth-weight result: OR decreased from 1.54 in 2012–2013 to 1.17 in 2020–2022.
  • Interpretation: rising diagnostic rates may reflect diagnostic-practice or health-care-capacity changes rather than underlying-risk changes alone.
  • Caution that the findings should not be read as showing ADHD or ASD have become less impairing at the individual level.
  • Scope limitation: findings are from Danish registry data, with diagnoses before age 18 and diagnosis years 2012–2022.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

3

Evidence read

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
“Individuals diagnosed with ADHD or ASD differed from controls across all characteristics, but differences diminished over time”
What this piece can’t prove

3 further details could not be confirmed from the summary.

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Papers considered

The selected paper, plus nearby candidates.

PubMed, Europe PMC, Crossref · 15 candidate papers

Candidate

Prescription Use of Paracetamol During Pregnancy and Risk of Autism Spectrum Disorder and Attention-Deficit/Hyperactivity Disorder in Early Childhood.

Journal of the American Academy of Child and Adolescent Psychiatry · 2026 · PubMed, Europe PMC

Tessa (opens in a new tab)Source (opens in a new tab)
Candidate

Sociodemographic risk factors among children with autism in metropolitan Atlanta, 1996

Paediatric and Perinatal Epidemiology · 2001 · Crossref

Source (opens in a new tab)

And 9 more candidates considered.