The average IQ of someone with ADHD is typically within the normal range, although it is often lower than the average IQ of someone without ADHD. There is no single IQ score that is considered "average" for someone with ADHD, and IQ scores can vary greatly between individuals. A number of studies have shown that the average IQ of people with ADHD is about 10 points lower than the average IQ of those without ADHD. However, this difference is not considered to be clinically significant and does not necessarily indicate that someone with ADHD is cognitively impaired.
It is important to remember that IQ is not the only factor that affects how someone with ADHD functions. Studies have shown that people with ADHD often have difficulty with executive functioning, which can impact their ability to pay attention, organize tasks, and make decisions. Additionally, people with ADHD frequently struggle with comorbid conditions such as anxiety and depression, which can further impact their functioning.
Overall, it is important to remember that IQ is not the only measure of intelligence and that people with ADHD can still lead successful and productive lives. It is also important to recognize that IQ scores are not a perfect measure of intelligence and that other measures, such as a person's level of functioning, can be more important than IQ scores when assessing someone's cognitive abilities.