From wikipedia, the free encyclopedia. Attention-Deficit Hyperactivity Disorder (ADHD) is a neurobehavioral developmental disorder affecting about 3-5% of the world's population. It typically presents during childhood, and is characterized by a persistent pattern of impulsiveness and inattention, with or without a component of hyperactivity. ADHD occurs twice as commonly in boys as in girls. ADHD is generally a chronic disorder with 10 to 40% of individuals diagnosed in childhood continuing to meet diagnostic criteria in adulthood. As they mature, adolescents and adults with ADHD are likely to develop coping mechanisms to compensate for their impairment.
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