智能迟滞(下称智迟)是一种严重危害儿童身心健康的症状,其患病率较高。为探索其流行情况及发病因素,并为制定防治措施,降低患病率提供科学依据,1988年6月我们组织了12个县区妇幼保健站(所)对杭州市(郊)和山区1729例7岁以下儿童进行了抽样调查,现将结果报道如下。对象和方法一、对象采用分层整群随机抽样方法,调查了杭州市小营街道8个居民区,郊 Intellectual retardation (hereinafter referred to as Chi Chi) is a serious harm to children’s physical and mental health symptoms, the higher the prevalence. In order to explore its prevalence and risk factors, and to provide a scientific basis for the development of prevention and control measures to reduce the prevalence, in June 1988 we organized 12 counties MCH stations (sub-districts) and Hangzhou in 1729 cases Children under the age of 7 were sampled and the results reported below. Subjects and methods First, the object using stratified cluster random sampling method to investigate the eight residential Xiaogang streets in Hangzhou, suburbs