方法：采用二阶段抽样法对254名51～75岁居民用多因素分析法进行了调查分析。
Method:254 people aged 51~75 with two stage sampling were investigated by using multifactor analyses.
方法采取现场无记名自主填写调查表，对应用二阶段抽样法随机抽取的1800名社区居民进行调查。
Methods The questionnaire survey forms were filled out on-the spot by 1800 residents who were at random selected.
方法：采用分层二阶段整群抽样方法，对重庆市3 547名中学生早餐饮食结构和营养知识进行调查。
Methods: the breakfast structure and the nutrition knowledge of 3 547 students in rural boarding middle school in Chongqing were investigated by adopting stratified two-stage cluster sampling method.
方法：采用分层二阶段整群抽样方法，对重庆市3 547名中学生早餐饮食结构和营养知识进行调查。
Methods: the breakfast structure and the nutrition knowledge of 3 547 students in rural boarding middle school in Chongqing were investigated by adopting stratified two-stage cluster sampling method.
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