Methods 5 kindergartens were selected by whole group sampling in Fuzhou city district, 778 infant parents answered the questionnaire investigation.
方法采用整群抽样方法在福州市区抽取5所幼儿园，并对778名幼儿家庭进行问卷调查。
Methods: Adopting the methods of whole group sampling at random, study on 306 children aged 4-6 of 14 kindergartens in Jing an District of Shanghai.
方法：采用随机整群抽样方法，在上海市静安区抽取14所幼儿园306名4 ~ 6岁儿童进行了研究。
Doctor Liu's research group chosen 50 schools in more than 300 movie-experimental schools in the whole country, and does the sampling and tracing analysis.
刘博士他们的研究小组，从2003年开始，在全国300多所电影课试验学校中，选择了50所学校，进行抽样跟踪分析。
MethodThe study was a cross sectional survey, sampling the whole group aged 80 years and above, who live in Jiajian country, Bama County.
方法截断面调查，整群抽取巴马县甲篆乡80岁以上老人。
MethodThe study was a cross sectional survey, sampling the whole group aged 80 years and above, who live in Jiajian country, Bama County.
方法截断面调查，整群抽取巴马县甲篆乡80岁以上老人。
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