Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabiled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)

Descriptor ID	D008607
MeSH Number(s)	C10.597.606.643 C23.888.592.604.646 F01.700.687 F03.550.600
Concept/Terms	Intellectual Disability Intellectual Disability Disabilities, Intellectual Intellectual Disabilities Mental Retardation Retardation, Mental Disability, Intellectual Mental Retardation, Psychosocial Mental Retardation, Psychosocial Mental Retardations, Psychosocial Psychosocial Mental Retardation Psychosocial Mental Retardations Retardation, Psychosocial Mental Retardations, Psychosocial Mental Deficiency, Mental Deficiency, Mental Deficiencies, Mental Mental Deficiencies Mental Deficiency Idiocy Idiocy

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