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Epidemiology What is ADHD? What is ADHD?

ADHD is the most common childhood neurodevelopmental disorder1

The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5®) defines ADHD as “A persistent pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development.”2

In order to meet the diagnostic criteria for ADHD, there must be clear evidence of interference with, or the reduced quality of, social, academic, or occupational functioning attributable to the symptoms2

  • Several inattentive or hyperactive-impulsive symptoms present prior to age 12 years
  • Several inattentive or hyperactive-impulsive symptoms present in two or more settings (e.g., at home, school, or work; with friends or relatives; in other activities)

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What is ADHD?

Prevalence Comorbidities


1. Perou R, Bitsko RH, Blumberg SJ, Pastor P, Ghandour RM, Gfroerer JC, et al. Mental health surveillance among children—United States, 2005-2011. MMWR Suppl. 2013 May;62(2):1-35.
2. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 5th Ed. APA, 2013.