The signs and symptoms of intellectual disability are all behavioral. Most people with intellectual disability do not look like they are afflicted with such, especially if the disability is caused by environmental factors such as malnutrition or lead poisoning are: Delays in oral language development, Deficits in memory skills, Difficulty learning social rules, Difficulty with problem solving skills, Delays in the development of adaptive behaviors such as self-help or self-care skills, Lack of social inhibitors.
Pathophysiology: Sometimes disability is caused by abnormal genes inherited from parents, errors when genes combine, or other reasons eg. Down syndrome, Klinefelter's syndrome, Fragile X syndrome (common among boys), neurofibromatosis, congenital hypothyroidism. Problems during pregnancy: Intellectual disability can result when the fetus does not develop properly.
Diagnosis: Belgium is a country with an approximate area of 33 thousand square kilometers (UNO, 2008). The population is 10,697,588 and the sex ratio (men per hundred women) is 96 (UNO, 2009). The proportion of the population under the age of 18 years is 20% and the proportion above age 60 is 17% (UNO, 2009). The literacy rates for men and women are unknown.