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智力低下是造成儿童身心残疾和影响我国儿童素质最主要的因素之一。为达到优生优育提高人口素质的目的，我们对我市智力低下儿童进行了调查。一、流调、监测目的．1．了解我市城乡儿童智力低下的患病率及其分布特征。2．探索我市城乡儿童智力低下的病因及其不明原因智力低下的
Mental retardation is one of the most important factors contributing to the physical and mental disability of children and the quality of children in our country. In order to achieve the purpose of prenatal and postnatal care to improve the quality of the population, we conducted a survey on children with mental retardation in our city. First, the flow control, monitoring purposes. 1. To understand the prevalence of mental retardation in urban and rural children and their distribution characteristics. 2. To explore the causes of mental retardation of children in urban and rural areas in our city and their mental retardation of unknown reasons