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that those with ASD, when compared to those with ID, were more likely to isolate themselves and make less eye contact.[14] When it comes to classification ID and ASD have very different guidelines. ID has a standardized assessment called the Supports Intensity Scale (SIS), this measures severity on a system built around how much support an individual will need. While ASD also classifies severity by support needed there is no standard assessment, clinicians are free to diagnose severity at their own judgment.[15] Causes Further information: X-linked intellectual disability An eight-year-old boy Down syndrome is the most common genetic cause of intellectual disability. Among children, the cause of intellectual disability is unknown for one-third to one-half of cases.[6] About 5% of cases are inherited from a person's parents.[7] Genetic defects that cause intellectual disability, but are not inherited, can be caused by accidents or mutations in genetic development. Examples of such accidents are development of an extra chromosome 18 (trisomy 18) and Down syndrome, which is the most common genetic cause.[7] Velocardiofacial syndrome and fetal alcohol spectrum disorders are the two next most common causes.[6] However, there are many other causes. The most common are: Genetic conditions. Sometimes disability is caused by abnormal genes inherited from parents, errors when genes combine, or other reasons. The most prevalent genetic conditions include Down syndrome, Klinefelter syndrome, Fragile X syndrome (common among boys), neurofibromatosis, congenital hypothyroidism, Williams syndrome, phenylketonuria (PKU), and Prader–Willi syndrome. Other genetic conditions include Phelan-McDermid syndrome (22q13del), Mowat–Wilson syndrome, genetic ciliopathy,[16] and Siderius type X-linked intellectual disability (OMIM 300263) as caused by mutations in the PHF8 gene (OMIM 300560).[17][18] In the rarest of cases, abnormalities with the X or Y chromosome may also cause disability. 48, XXXX and 49, XXXXX syndrome affect a small number of girls worldwide, while boys may be affected by 49, XXXXY, or 49, XYYYY. 47, XYY is not associated with significantly lowered IQ though affected individuals may have slightly lower IQs than non-affected siblings on average.[19][20] Problems during pregnancy. Intellectual disability can result when the fetus does not develop properly. For example, there may be a problem with the way the fetus's cells divide as it grows. A pregnant woman who drinks alcohol (see fetal alcohol spectrum disorder) or gets an infection like rubella during pregnancy may also have a baby with intellectual disability. Problems at birth. If a baby has problems during labor and birth, such as not getting enough oxygen, he or she may have developmental disability due to brain damage. Exposure to certain types of disease or toxins. Diseases like whooping cough, measles, or meningitis can cause intellectual disability if medical care is delayed or inadequate. Exposure to poisons like lead or mercury may also affect mental ability.
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