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Attention-Deficit/Hyperactivity Disorder

Attention-deficit/hyperactivity disorder (ADHD) is one of the most frequently diagnosed disorders among children and adolescents. It is a lifelong condition that is estimated to affect 3% to 5% of school-age children. The disorder is characterized by core symptoms that include age-inappropriate levels of concentration, attention, distractibility, and impulsive behavior. For example, affected children seem unable to sit still, always appear to be daydreaming, or cannot focus on tasks long enough to finish. Children may exhibit a range of characteristics and varying levels of severity. Behaviors associated with ADHD are classified into three subtypes: predominantly inattentive, predominantly hyperactive-impulsive, and combined. Because ADHD often affects functioning in multiple settings, such as home, school, and peer relations, it may have a negative, long-term impact on academic and vocational ...

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