Editing Attention deficit hyperactivity disorder (section)

===IQ test performance===
Certain studies have found that people with ADHD tend to have lower scores on [[intelligence quotient]] (IQ) tests.<ref name="Frazier_2004">{{cite journal |vauthors=Frazier TW, Demaree HA, Youngstrom EA |title=Meta-analysis of intellectual and neuropsychological test performance in attention-deficit/hyperactivity disorder |journal=[[Neuropsychology (journal)|Neuropsychology]] |volume=18 |issue=3 |pages=543–555 |date=July 2004 |pmid=15291732 |doi=10.1037/0894-4105.18.3.543 |s2cid=17628705}}</ref> The significance of this is controversial due to the differences between people with ADHD and the difficulty determining the influence of symptoms, such as distractibility, on lower scores rather than intellectual capacity. In studies of ADHD, higher IQs may be over-represented because many studies exclude individuals who have lower IQs despite those with ADHD scoring on average nine points lower on standardised intelligence measures.<ref name="Mackenzie_2016">{{cite journal |vauthors=Mackenzie GB, Wonders E |title=Rethinking Intelligence Quotient Exclusion Criteria Practices in the Study of Attention Deficit Hyperactivity Disorder |journal=[[Frontiers in Psychology]] |volume=7 |page=794 |date=2016 |pmid=27303350 |pmc=4886698 |doi=10.3389/fpsyg.2016.00794 |doi-access=free}}</ref> However, other studies contradict this, saying that in individuals with high intelligence, there is an increased risk of a missed ADHD diagnosis, possibly because of compensatory strategies in said individuals.<ref>{{cite journal |vauthors=Rommelse N, van der Kruijs M, Damhuis J, Hoek I, Smeets S, Antshel KM, Hoogeveen L, Faraone SV |title=An evidenced-based perspective on the validity of attention-deficit/hyperactivity disorder in the context of high intelligence |journal=[[Neuroscience & Biobehavioral Reviews]] |volume=71 |pages=21–47 |date=December 2016 |pmid=27590827 |doi=10.1016/j.neubiorev.2016.08.032 |hdl-access=free |s2cid=6698847 |hdl=2066/163023}}</ref>

Studies of adults suggest that negative differences in intelligence are not meaningful and may be explained by associated health problems.<ref>{{cite journal |vauthors=Bridgett DJ, Walker ME |title=Intellectual functioning in adults with ADHD: a meta-analytic examination of full scale IQ differences between adults with and without ADHD |journal=Psychological Assessment |volume=18 |issue=1 |pages=1–14 |date=March 2006 |pmid=16594807 |doi=10.1037/1040-3590.18.1.1}}</ref>