For ADHD, the interventions that held up were the ones that changed the environment
A meta-analysis separating blinded from unblinded outcomes across 54 randomised trials
Reviewed by Sian Trombley, CCCFounder, Thrive Family Company
Moderate confidence
Source citation
Sonuga-Barke EJS, Brandeis D, Cortese S, et al. (2013). Nonpharmacological interventions for ADHD: systematic review and meta-analyses of randomized controlled trials of dietary and psychological treatments. American Journal of Psychiatry, 170(3), 275–289. https://doi.org/10.1176/appi.ajp.2012.12070991
Published 1 March 2013 · Added to Thrive 1 March 2013 · Reviewed 26 July 2026
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When ratings came from people who knew which treatment a child received, almost everything looked effective. When they came from blinded assessors, the picture narrowed sharply.
Published research findings
The study
The European ADHD Guidelines Group pooled randomised trials of dietary and psychological treatments, analysing outcomes separately for raters who were and were not blinded to treatment allocation.
What researchers examined
Whether behavioural, cognitive-training, neurofeedback and dietary interventions reduced core ADHD symptoms under blinded assessment.
What they found
Effects were substantial with unblinded raters but shrank considerably under blinded assessment. Free fatty acid supplementation and artificial food colour exclusion retained small effects; behavioural interventions showed clear value for parenting and functional outcomes rather than core symptom reduction.
Thrive editorial interpretation
What this may mean for families
Behavioural parent work is worth doing for the reasons it actually delivers: calmer routines, better relationships, fewer daily collisions — not as a symptom cure.
What this doesn't tell us
Important limitations
Trials varied widely in quality and content, and pooling heterogeneous programmes can obscure what a well-delivered single intervention achieves.
Evidence confidence describes how much weight this study's design can carry — not how strongly the finding applies to any individual child or family.
Therapist perspective — Thrive interpretation, not a finding of the study
Therapist Perspective
I am honest with parents about this one. Structure, visuals and immediate feedback make family life workable; they do not remove ADHD, and no programme should be sold as if it does.
Practical family considerations
Judge a strategy by whether the day runs better, not by whether the ADHD disappears.
This research summary is educational and does not replace individualized medical, psychological or therapeutic advice.
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Behavioural parent programmes changed parenting and conduct — even where symptom ratings held steady
2014 · Meta-analysis
Strong confidence
Why it matters
Behavioural work is best framed as improving family life and behaviour around ADHD, rather than removing inattention itself.