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Published online by Cambridge University Press: 07 November 2014
The National Comorbidity Survey Replication by Kessler and colleagues found that of adult patients with major depressive disorder (MDD), 9.4% met Diagnostic and Statistical Manual of Mental Disorders, Third Edition-Revised criteria for attention-deficit/hyperactivity disorder (ADHD). Among those with dysthymia, 22.6% also met criteria for ADHD. In addition, it is estimated that approximately a third of the United States population experiences MDD symptoms at any point in time. Kessler and colleagues also conducted a retrospective study on impairment of adults with ADHD and found that ADHD has a prevalence of ∼4.4% in the US adult population, which suggests that ∼9 million US adults may have ADHD.