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在1987年全国残疾人抽样调查中,共查出智力残疾者15235人,占总残疾人数的19.7%,智力残疾的现患率为0.96%。按其智商(IQ)分为极重度、重度、中度和轻度三类,其中中度和轻度智力残疾占74.7%,在地区分布中,乡级地区的智力残疾发生明显高于市、镇级地区,这可能与乡级地区的地方病发生,近亲结婚率高等因素有关。有智力残疾的病因中,先天性的因素十分突出。
In the 1987 National Sample Survey on People with Disabilities, a total of 15235 persons with mental disabilities were found, accounting for 19.7% of the total number of disabled persons and the prevalence rate of mental disabilities was 0.96%. According to their intelligence (IQ), they were divided into three categories: severe, moderate, mild and moderate, of which moderate and mild mental disabilities accounted for 74.7% .In the regional distribution, the occurrence of mental disabilities in the township level was significantly higher than that of the city, Township level, which may be related to endemic diseases in the township level, higher cousin’s marriage rate and other factors. Among the causes of mental disability, congenital factors are prominent.