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Mental Retardation

Mental retardation is a disability characterized by significant limitations in both intellectual functioning and adaptive behavior. The disability originates in the developmental period before the age of 18. Individuals with mental retardation are a heterogeneous group. There is no single cause of the disability, and areas of strengths and weaknesses can differ widely from individual to individual. Most individuals with this disability have IQs in the higher ranges of mental retardation, and their disability may be initially noticed primarily on academic tasks.

Between 1% and 3% of the total population in the United States has mental retardation. It is difficult to precisely calculate the number because individuals are not routinely screened, preferred terms for the disability may vary among jurisdictions, and states sometimes use different eligibility ...

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