论文部分内容阅读
我们于 2 0 0 0年 10月对平湖市乍浦港区学龄儿童当年水痘和流行性腮腺炎进行了一次调查 ,结果报告如下。1 对象和方法1.1 研究人群 采取整群抽样方法 ,调查乍浦中心小学与三所乡村小学的 6～ 13岁学生 2 5 0 4人 ,其中城镇 12 81人 ,农村 12 2 3人。1.2 调查方法 设计统?
In October 2000, we conducted a survey on chickenpox and mumps in our school-age children in Zhapu District of Pinghu City. The results are reported as follows. 1 Subjects and Methods 1.1 Study Population A cluster sampling method was used to investigate the number of students aged 6-13 in Zhapu Central Primary School and three rural primary schools, of which 12,81 were urban residents and 12,23 were rural residents. 1.2 Survey Design System?