Attention deficit hyperactivity disorder (ADHD)

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Attention deficit hyperactivity disorder (ADHD) is classified as a psychiatric disorder characterized by a continual pattern of inattention, distractibility, impulsivity, and hyperactivity.
Beginning in childhood, ADHD is one of the most commonly diagnosed psychiatric disorders in children and adolescents. ADHD becomes apparent in some children in the preschool and early school years.
ADHD is thought to affect about 9.2% of boys and 2.9% of girls who are of school age.
While it is estimated that about 4.4% of adults also suffer from ADHD, the condition often goes unrecognized in adults. It is believed that around 60% of children diagnosed with ADHD retain the disorder as adults.
Adults with ADHD are diagnosed under the same criteria, including the stipulation that their symptoms must have been present prior to the age of seven.
ADHD is divided into three subtypes based on symptoms including inattentive type, hyperactive-impulsive type, and combined type with both inattention and hyperactivity-impulsiveness.
The most common ADHD subtype is the combined type; females are more likely to have the inattentive type.

Related Terms

ADD, ADHD, attention deficit disorder, Conners' Rating Scale, hyperkinetic disorder, hyperkinetic syndrome.