The IQs of children with ADHD are normally distributed

The purpose of this investigation was to determine whether or not attention -deficit/hyperactivity disorder (ADHD)-when there was an absence of reading problems-was associated with having a high IQ. The vocabulary and block de sign short forms of the Wechsler Intelligence Scale for Children-Third Edit ion were administered to 63 children with ADHD, 69 children with reading di fficulties (RD), and 68 children with comorbid ADHD + RD. Results indicated that the distributions of estimated Full Scale IQs (FSIQ) for each of the three groups of children did not differ significantly from a normal distrib ution, with the majority of children (more than 50%) in each group scoring in the average range, The percentage of children with ADHD who scored in th e above-average range for FSIQ was not significantly higher than the percen tages of children in the other two groups. No significant group differences emerged for estimated FSIQ, vocabulary, or block design. It was concluded that children with ADHD are no more likely to have an above-average IQ than are other children.