47,XX,+21; 47,XY,+21; Trisomy 21
Mental retardation (also called mental handicap and the UK Mental Health Act (1983) defines mental impairment and severe mental impairment) is a term for a pattern of persistently slow learning of basic motor and language skills ("milestones") during childhood, and a significantly below-normal global intellectual capacity as an adult. One common criterion for diagnosis of mental retardation is a tested intelligence quotient (IQ) below 70.
A disorder caused by the presence of an extra chromosome 21 and characterized by mental retardation and distinguishing physical features.
Mental Retardation as related to Down Syndrome
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The National Institute of Mental Health (NIMH) is the largest scientific organization in the world dedicated to research focused on the understanding, treatment, and ...
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From the National Information Center for Children and Youth with Disabilities, a statewide listing of organizations, contact person, phone numbers and e-mail addresses.