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一、实验观察方法 1.地点确定陕西省大骨节病高发病区的耀县4个乡,11个村,8所小学为实验点。 2.观察对象 7～14岁儿童。 3.分组分服硫酸锌+硒盐组,硫酸锌组,硒盐组及对照组。分组情况见表1、表2。
First, the experimental observation method 1. Location to determine the incidence of Kashin-Beck disease in Shaanxi Province Yao four townships, 11 villages, 8 primary schools as the experimental point. 2.Objective Children aged 7 to 14 years old. 3. Divide the group serving zinc sulfate + selenium salt group, zinc sulfate group, selenium salt group and control group. Grouping in Table 1, Table 2.