Prevalence Rates of Attention Deficit Hyperactivity Disorder in a School Sample of Venezuelan Children.

…that persist in about a third of patients across the life-span. Since Still made the first description of a group of 20 children with different degrees of aggression, hostility, defiant behavior, and hyperactivity, there have been several attempts to conceptualize a syndrome which might group those symptoms. Early in the history of this disorder it was thought that the core symptom was the excess of activity; later, it was considered as a companion factor for the deficits in attention. Recently, DSM-IV-TR considers ADHD as a syndrome with two dimensions: attention deficit and hyperactivity-impulsivity, dimensions that have been confirmed through factorial analysis studies…

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