方法：采用二阶段抽样法对254名51～75岁居民用多因素分析法进行了调查分析。
Method:254 people aged 51~75 with two stage sampling were investigated by using multifactor analyses.
方法采取现场无记名自主填写调查表，对应用二阶段抽样法随机抽取的1800名社区居民进行调查。
Methods The questionnaire survey forms were filled out on-the spot by 1800 residents who were at random selected.
采用多阶段分层随机抽样法对2岁以下儿童进行疾病状况询问调查。
Multistage stratified random sampling was conducted an interview survey in status of illness for children under 2 years old.
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