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为了解广西壮族地区中学生铁营养状况,我们于1988年4月对田东县477名中学生进行调查,现将结果报告如下: 1对象与方法 1.1研究对象:以随机分层抽样方式对田东县县城四所中学477名中学生进行调查(男304,女173),占全县中学生人数
In order to understand the status of iron nutrition of middle school students in Guangxi Zhuang Autonomous Region, we conducted a survey on 477 middle school students in Tiandong County in April 1988. The results are reported as follows: 1 Subjects and Methods 1.1 Subjects: A random sample of Tiandong 477 middle school students from four secondary schools in the county (male 304, female 173), accounting for the number of middle school students in the county