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为探讨智残儿童头发中锌、铜、铁、锰等微量元素的含量与正常儿童是否存在差异，我们于1997年9月对我市培智学校的智残儿童进行了调查。1对象与方法1．1对象：抽取智残儿童72人，其中男生37人，女生35人；同时随机抽取了我市正常儿童400人，其中男生230人，女生170人，年龄均在
In order to investigate whether the contents of zinc, copper, iron, manganese and other trace elements in the hair of mentally retarded children are different from those of normal children, we investigated the mentally handicapped children in our Zhizhi school in September 1997. 1 Subjects and Methods 1.1 Subjects: 72 children with mental disabilities were enrolled, of which 37 were boys and 35 were girls; at the same time, 400 children were randomly selected from our city, including 230 boys and 170 girls, aged from