Attention-deficit hyperactivity disorder: Classification

is a , in that, in the diagnosed population, certain traits such as impulse control significantly lag in development when compared to the general population[8]. Using magnetic resonance imaging, this developmental lag has been estimated to range between 3 years, to 5 years in the prefrontal cortex of those with patients in comparison to their peers[9]; consequently these delayed attributes are considered an impairment. has also been classified as a and a neurological disorder [10] or combinations of these classifications such as neurobehavioral or .
Three forms of are thought to exist, -PI or Primarily Inattentive (previously known as ADD or ), -PH/I or Primarily Hyperactive/Impulsive, and -C or combined type. The majority of studies have looked at -C, with much less work done on -PI

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