Comparison of Neuropsychological Functioning Between Adults With Early- and Late-Onset ADHD.

We aimed to compare the visually dependent neuropsychological functioning among adults with (5th ed.; ) ADHD who recalled symptom onset by and after age 7 and non-ADHD controls. We divided the participants, aged 17 to 40 years, into three groups-(a) ADHD, onset <7 years (early-onset, = 142); (b) ADHD, onset between 7 and <12 years (late-onset, = 41); (c) non-ADHD controls ( = 148)-and compared their neuropsychological functioning, measured by the Cambridge Neuropsychological Testing Automated Battery. Both ADHD groups had deficits in attention and signal detectability, spatial working memory, and short-term spatial memory, but only the early-onset group showed deficits in alertness, set-shifting, and planning after controlling for age, sex, and psychiatric comorbidities. There was no statistical difference between the two ADHD groups in neuropsychological functioning. criteria for diagnosing adult ADHD are not too lax regarding neuropsychological functioning.