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Intellectual disability (ID), also known as general learning disability[3] and mental retardation (MR),[4][5] is a generalized neurodevelopmental disorder characterized by significantly impaired intellectual and adaptive functioning. It is defined by an IQ under 70, in addition to deficits in two or more adaptive behaviors that affect everyday, general living. Once focused almost entirely on cognition, the definition now includes both a component relating to mental functioning and one relating to an individual's functional skills in their daily environment. As a result of this focus on the person's abilities in practice, a person with an unusually low IQ may still not be considered to have intellectual disability. Intellectual disability is subdivided into syndromic intellectual disability, in which intellectual deficits associated with other medical and behavioral signs and symptoms are present, and non-syndromic intellectual disability, in which intellectual deficits appear without other abnormalities. Down syndrome and fragile X syndrome are examples of syndromic intellectual disabilities. Intellectual disability affects about 2–3% of the general population.[6] Seventy-five to ninety percent of the affected people have mild intellectual disability.[6] Non-syndromic, or idiopathic cases account for 30–50% of these cases.[6] About a quarter of cases are caused by a genetic disorder,[6] and about 5% of cases are inherited from a person's parents.[7] Cases of unknown cause affect about 95 million people as of 2013.[8] Contents 1 Signs and symptoms 1.1 Co-morbidity 2 Causes 3 Diagnosis 3.1 Intelligence quotient 3.2 Distinction from other disabilities 3.3 Limitations in more than one area 4 Management 5 Epidemiology 6 History 6.1 Terminology 7 Society and culture 8 Health disparities 9 See also 10 References 11 Further reading 12 External links Signs and symptoms
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