There were 84 subjects with AE misclassified as ADHD. In comparison to the AE subjects that were correctly classified (n = 125), these subjects differed significantly on FSIQ (higher), country (fewer from South Africa than U.S.), race (more White), ethnicity (more Hispanic), all measures of growth deficiency (less likely), microcephaly (less likely), structural abnormality (less likely), and thin vermillion (less likely). They were marginally different on handedness (fewer right handed; Fisher’s exact p = .075), short palpebral fissures (less likely; Fisher’s exact p = .077), and smooth philtrum (less likely; Fisher’s exact p = .078). They did not differ on age, sex, or presence of an ADHD diagnosis. They differed significantly on all of the neuropsychological variables (misclassified > correctly classified).
