论文部分内容阅读
为了解山东省学龄儿童的锌营养状况，作者采取分层整群抽样原则，随机抽取济南、烟台、济宁克矿集团、胜利油田、日照及枣庄六市地的6－12岁学龄儿童进行了此项调查。l对象与方法l．l对象六市地共抽取2175名学龄儿童，其中济南362名，烟台380名，充矿集团400名，胜利油田W名，
To understand the nutritional status of school-age children in Shandong Province, the authors adopted the stratified cluster sampling principle and randomly selected 6-12-year-old school-age children in Jinan, Yantai, Jining Kemi Group, Shengli Oilfield, Rizhao and Zaozhuang Investigation. l objects and methods l. l Targets A total of 2175 school-age children were sampled from six cities, including 362 in Jinan, 380 in Yantai, 400 in Chongming Group, W in Shengli Oilfield,