... cluster stratification sampling 整群分层抽样 cluster random sampling method 整群随机抽样方法 multi-stage cluster random sampling 多阶段整群随机抽样 ...
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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：本研究采用分层随机抽样方法和整群随机抽样方法。
Methods: The stratified sampling and cluster random sampling methods are used in this survey.
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