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This, by the way, applies to every test (including school tests) where focus is required.
The score can be lower 2-7 IQ points, the review says
pubmed.ncbi.nlm.nih.gov
The score can be lower 2-7 IQ points, the review says

Do attention deficits influence IQ assessment in children and adolescents with ADHD? - PubMed
The associations between IQ and attention deficits in ADHD are generally modest, with the mean influence on IQ probably amounting to 2 to 5 IQ points. This may serve as a benchmark when clinicians interpret the validity of IQ in this clinical population.
