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为掌握克山病人病情现状，我们于1998年9月、11月分别对洛宁、卢氏两县的克山病病情进行调查，现将资料整理如下：1调查方法每个县均按照分层随机抽样的原则，在重、中、轻病区乡中各抽取一个乡，再在每个乡中抽取一个行政村，每个行政村中抽取2—3个自然村作为调查点。对每个
In order to grasp the current condition of Keshan patients, we investigated the conditions of Keshan disease in Luoning and Lushi in September and November 1998. The data are now collated as follows: 1 Survey methods Each county is stratified According to the principle of random sampling, one township shall be selected from each of the townships of heavy, medium and minor wards, and one administrative village shall be selected from each township. Two to three natural villages shall be selected as survey sites in each administrative village. For each