方法采取分层整群随机抽样方法进行问卷调查。
Methods Stratified cluster random sampling was carried out in prevalence survey and questionnaires was applied.
研究方法本研究采用分层整群随机抽样方法进行抽样。
RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
方法采用分层整群随机抽样的方法，对13个中签县市39个村(点)进行调查。
Methods Cluster random sampling was used for investigation of 39 villages selected from 13 counties.
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