Do attention deficits influence IQ assessment in children and adolescents with ADHD?J Atten Disord. 2009 May; 12(6):551-62.JA
To characterize the relationship between IQ and attention deficits in children with ADHD and to estimate the inattention-related mean influence on IQ when children are tested before stimulant drug treatment has been initiated.
Studies of various methodologies are reviewed.
Correlation studies show mostly weak associations between IQ scores and attention deficits. Meta-analyses report the average short-term stimulant treatment effect on IQ in children with ADHD to be 2 to 7 IQ points.
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.