A household survey was conducted over 6229 rural households in which there were 15667 persons through stratified and cluster sampling.
本研究采用分层整群随机抽样方法，共调查农村6229户家庭，15667人。
Methods: The stratified sampling and cluster random sampling methods are used in this 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。
DESIGN: Cluster sampling and stratified analysis.
设计：整群抽样，分层分析。
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