Attention-deficit/hyractivity disorder (ADHD) is a developmental disorder with the cardinal features of difficulties with sustained attention, distractibility, hyperactivity, and impulse control. It arises early in childhood, typically between 3 and 7 years of age. The disorder is relatively stable over time and persists through adolescence and into adulthood in more than half the cases. A significant proportion of children will experience school failure and will develop conduct disorders,

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... quent activities, and antisocial personalities. As a result, the burden of ADHD to affected individuals, to their families, and to society is considerable.