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A massive Danish study of 2.1 million young people finds that kids diagnosed with ADHD or autism today look a lot more like the general population than those diagnosed a decade ago. The shift suggests rising diagnosis rates may partly reflect broader identification and evolving diagnostic patterns — not just a true spike in these conditions. Published in JAMA Psychiatry, the findings could reshape how we interpret prevalence trends.
A landmark study published in JAMA Psychiatry — led by ISGlobal and Aarhus University — analyzed data from over 2.1 million children and adolescents in Denmark and found that the profile of kids being diagnosed with ADHD or autism spectrum disorder (ASD) has meaningfully shifted over the past decade. Young people receiving these diagnoses today resemble the general population far more closely than those diagnosed 10 years ago.
Historically, ADHD and ASD diagnoses were more concentrated among children with risk factors like low birth weight, premature birth, lower household income, or parents with psychiatric histories. While those associations still exist, they've weakened considerably — suggesting that diagnoses are now reaching a broader, more diverse population.
By the Numbers:
Why it matters: These findings don't mean ADHD or autism are being overdiagnosed or are less severe. Rather, they signal that expanded awareness, better access to evaluations, and shifting diagnostic thresholds are bringing more children into the fold — which has real implications for how healthcare systems plan services and how researchers interpret outcome trends.
