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１９８５年１月～１９９２年６月对经ＷＩＳＣ－ＣＲ智能测试后的３２２例智低儿童进行分析，轻度ＭＲ４５．３４％，中度ＭＲ４０．０６％，重度ＭＲ１４．６０％。１７６例ＭＲ儿童头围与６７例正常儿童比较：智低儿童头围在±ＳＤ范围内者极明显低于正常儿童（Ｐ＜０．００１）。在ＭＲ儿童中，头围越小，智能水平越低（Ｐ＜０．００１）。智低可由多种因素引起，遗传因素占首位，其次是孕期各种影响脑发育的因素和产时产后直接、间接导致脑细胞损伤的原因也较常见，视、听障碍导致ＭＲ应引起重视。因此做好妇女保健工作，开展婚前健康检查，遗传咨询，指导优生优育，提高围产保健质量等都是预防ＭＲ儿童发生的必要措施。
From January 1985 to June 1992, 322 cases of Wisdom Intelligence Children after WISC-CR intelligent test were analyzed. Mild MR was 45.34%, moderate MR was 40.06% and severe MR was 14.60%. The head circumference of 176 MR children was significantly lower than that of normal children (P <0.001) compared with 67 normal children. In MR children, the smaller the head circumference, the lower the intelligence level (P <0.001). Chi low can be caused by a variety of factors, genetic factors in the first place, followed by a variety of factors that affect brain development during pregnancy and postpartum birth, direct and indirect causes of brain cell damage are more common, visual and hearing disorders lead to MR should pay attention. So doing a good job in women’s health care, premarital health checkup, genetic counseling, guidance of prenatal and postnatal care, improve the quality of perinatal care are all necessary measures to prevent the occurrence of MR children.