High Quality Content by WIKIPEDIA articles! Attention deficit disorder (ADD) is one of the three subtypes of attention-deficit hyperactivity disorder (ADHD). The term was formally changed in 1994 in the new Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) to "ADHD predominantly inattentive" (ADHD-PI or ADHD-I), though the term attention deficit disorder is still widely used. ADD is similar to the other subtypes of ADHD in that it is characterized primarily by inattention, easy distractibility, disorganization, procrastination, and forgetfulness; where it differs is in lethargy - fatigue, and having fewer or no symptoms of hyperactivity or impulsiveness typical of the other ADHD subtypes. Different countries have used different ways of diagnosing ADD. In the UK, diagnosis is based on quite a narrow set of symptoms, and about 0.5–1% of children are thought to have attention or hyperactivity problems. The USA used a much broader definition of the term ADHD....

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