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。
RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
研究方法本研究采用分层整群随机抽样方法进行抽样。
Methods: Epidemiological survey of tuberculosis was conducted by cluster random sampling in the elderly in rural area.
方法：采取整群随机抽样方法，对本市农村地区老年人群进行结核病流行病学抽样调查。
Methods 1421 students from 4 high middle schools in Puyang City were selected to undergo a questionnaire survey by cluster random sampling.
方法采用整群抽样方法，对濮阳市4所高中的1421名学生进行问卷调查。
Methods: in the communities chosen by stratified cluster random sampling method, we used Geriatric Depression Scale (GDS) to screen about 528 old people to identify the depressed ones.
方法：采用分层整群随机抽样方法在抽取的社区居委会，用老年抑郁量表(GDS)对528名社区老年人进行筛查。
Methods Cluster random sampling was used for investigation of 39 villages selected from 13 counties.
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。
Method Cluster random sampling method was used to conduct a household survey on the elderly in Luoping Country, Yunnan.
方法采用整群随机抽样的方法，对云南省罗平县的老年人进行入户问卷调查。
Methods: Cluster random sampling was used for door-to-door questionnaire survey. Using self-made questionnaire drew 386 elderly at random from 12 communities of Wenzhou City.
方法：采用整群随机抽样入户调查的方法，用自制问卷对温州市城区12个社区386名老年人进行调查。
Methods: Cluster random sampling was used for door-to-door questionnaire survey. Using self-made questionnaire drew 386 elderly at random from 12 communities of Wenzhou City.
方法：采用整群随机抽样入户调查的方法，用自制问卷对温州市城区12个社区386名老年人进行调查。
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