Method:A cluster sampling study on the condition of injuries was conducted among 1059 rural inhabitants in a certain township in Tongjiang County, Sichuan province from Jan 1998~Jan 1999.
方法：采用整群抽样方法，对四川省通江县某乡1059名农村居民一年中伤害发生情况进行调查。
Method cluster sampling and cross sectional study.
方法整群抽样，横断面调查。
DESIGN: Randomized cluster sampling, cross-sectional study.
设计：随机整群抽样，横断面调查。
Methods Using cluster sampling, the study was conducted in a secondary technical school in Hefei, and the available questionnaire were analysed.
方法采用整群抽样的方法在合肥市某中专学校进行问卷调查，并对有效问卷进行统计分析。
Methods using cluster sampling , the study was conducted in a secondary technical school in hefei , and the available questionnaire were analysed.
方法采用整群抽样的方法在合肥市某中专学校进行问卷调查，并对有效问卷进行统计分析。
Methods: 790 crew men receiving special training from the naval destroyers were selected by cluster sampling and investigated with prospective study.
方法：以整群抽样方式选取海军某驱逐舰支队官兵790人，对全年军事训练伤进行前瞻性流行病学调查。
DESIGN: Randomized cluster sampling and cross-sectional study.
设计：随机整群抽样，横断面调查。
Methods 3 460 children aged 3 to 6 were enrolled into this study by using a stratified cluster sampling method in Wuhan. Parents of the children were surveyed with a questionnaire.
方法采用分层整群抽样方法抽取武汉市3 460名3~6岁儿童作为研究对象，应用自行设计的儿童睡眠状况问卷对儿童家长进行调查。
Methods The study was performed by systematic and cluster sampling and questionnaire.
方法采用系统整群抽样的方法，以填写调查表的形式进行问卷调查。
Methods The study was performed by systematic and cluster sampling and questionnaire.
方法采用系统整群抽样的方法，以填写调查表的形式进行问卷调查。
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