NCIt related terms : Attention Deficit/Hyperactivity Disorder;
NCIt definition : A disorder characterized by a marked pattern of inattention and/or hyperactivity-impulsivity
that is inconsistent with developmental level and clearly interferes with functioning
in at least two settings (e.g. at home and at school). When present, the symptoms
of hyperactivity are most often present before the age of 7 years. There are three
recognized presentations or subtypes from most to least common: combined type, inattentive/distractible
type, hyperactive/impulsive type.;
Alternative definition : NICHD: A neurodevelopmental disorder presenting in early childhood that is characterized
by chronic and excessive inattention, overactivity, and/or impulsivity.;