Earlier identification of ADHD linked to better school outcomes
What does a large-N longitudinal study reveal?
Publishing 8 April 2026 in JAMA Psychiatry, Lotta Volotinen, Hanna Remes, Pekka Martikainen, and Niina Metsä-Simola reported the results of a longitudinal study of a population-based cohort of nearly 16,000 children with ADHD in Finland. They determined the age during their childhood that each child was diagnosed as having ADHD and then related the age of identification with outcomes at the end of the school years. They found that diagnosis at earlier ages was associated with better grade point averages, completion of more academic than vocational coursework, and lower dropout rates at school completion than diagnoses at ages closer 16 years.
Here is the formal abstract:
MPORTANCE Early diagnosis of attention-deficit/hyperactivity disorder (ADHD) is often recommended, but it is unknown whether age at diagnosis is associated with educational outcomes.
OBJECTIVE To estimate whether age at ADHD diagnosis is associated with school performance, completed degrees, educational enrollment, and school dropout.
DESIGN, SETTING, AND PARTICIPANTS This population-based cohort study used national registry data for individuals born in Finland between January 1, 1990, and December 31, 1999, followed up until age 20 years. Individuals were born without a diagnosis of intellectual disability (International Statistical Classification of Diseases and Related Health Problems, Tenth Revision [ICD-10] codes F70-F79). Analyses were conducted from May 2024 to December 2025.
EXPOSURES Age at ADHD diagnosis, identified by the first clinical diagnosis (International Classification of Diseases, Ninth Revision code 314; ICD-10 code F90; or medication purchase).
MAIN OUTCOMES AND MEASURES Grade point average (GPA; range, 4 [failing] to 10 [excellent]) at the end of compulsory education (approximately 16 years of age), completed degrees in upper secondary education (vocational or academic), enrollment in tertiary education, and school dropout at age 20 years.
RESULTS The study sample included 580 132 individuals (51.2% male). Of these, 12 208 males (2.1%) and 3753 females (0.7%) had a first ADHD diagnosis between ages 4 and 20 years: mean (SD) age for males was 11.3 (4.1) years and for females was 14.4 (4.6) years. ADHD diagnosis at any age was associated with worse educational outcomes and greater likelihood of vocational than academic upper secondary education. After adjusting for sociodemographic covariates, if a diagnosis was received by age 16 years, younger age was associated with higher GPA for males (range, 7.12 [95% CI, 6.99-7.26] at age 4 years to 6.52 [95% CI, 6.46-6.58] at age 16 years) and females (range, 7.64 [95% CI, 7.49-7.78] at age 6 years to 6.95 [95% CI, 6.82-7.07]) at age 12 years, higher probability of completing an academic upper secondary degree for males (range, 20.77% [95% CI, 15.41%-26.12%] at age 4 years to 5.29% [3.78%-6.80%] at age 15 years) and females (range, 31.04% [95% CI, 15.60%-46.47%] at age 4 years to 12.01% [95% CI, 7.80%-16.21%] at age 14 years), and lower probability of school dropout for males (range, 9.16% [95% CI, 4.89%-13.42%] at age 4 years to 29.52% [95% CI, 25.85%-33.19%] at age 16 years) and females (range, 9.57% [95% CI, 4.49%-14.65%] at age 6 years to 27.16% [95% CI, 19.75%-34.57%] at age 13 years). However, after educational track choices (ages 17-20 years), older age at diagnosis was associated with higher and more academic education.
CONCLUSIONS AND RELEVANCE In this cohort study, earlier age at ADHD diagnosis was associated with better school performance, more academic education, and lower school dropout rates than diagnoses closer to age 16 years. The findings suggest that individuals who are diagnosed closer to age 16 years could benefit from targeted support to prevent school dropout.
There is a lot to like about this study. First, the sample is drawn from the entire population of children born during the given time period. When one is studying the population, there are greatly reduced difficulties—i.e., none—with generalizing from a sample to the population! Of course, given that the population is from a particular group, then one can reasonably ask about generality. Do the results apply to other populations. In this case what Ms. Volotinen and her colleague found clearly applies to children in Finland but we might wonder whether it applies to children in, say, Norway, Kenya, the US, or elsewhere. But, absent compelling evidence that there are geographic, ethnic, tropicality, or other region-connected factors that plausibly affect ADHD, those objections are not particularly tenable. Still, when we think about the relationships between age of diagnosis and later school outcomes, we should remember that, however well done it may be, we should remember that the results of this study come from a particular population.
We should also remember that we don’t know what happened to those children who were diagnosed later in comparison to those diagnosed earlier. We don’t know what therapies, treatments, or educational services they got. It’s sad that we can’t connect the data set that Volotinen et al. used with another data set that shows say, educational and social services all those children received. Does getting identified earlier mean that, for example, you get sustained individualized behavioral training? Without additional data, we can only speculate.
At bottom, though, it’s good to have these results. They underscore long-standing ideas about the benefits about early identification.
Reference
Volotinen, L., Remes, H., Martikainen, P., & Merst-Simola, N. (2026). Age at first attention-deficit/hyperactivity disorder diagnosis and educational outcomes. JAMA Psychiatry, published online 8 April 2026. https://doi.org/10.1001/jamapsychiatry.2026.0181