Source: National Nutrition Sampling Survey in 1992.
资料来源: 1992年全国营养抽样调查.
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Source: National Nutrition Sampling Survey in 2002.
资料来源: 2002年中国居民营养与健康状况调查.
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Methods: The number of samples was calculated with the optimum allocation stratified random sampling survey.
应用最优分配随机分层抽样方法确定调查点.
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It mainly included Focus Group Discussion, Participatory Observation, Delphi technique, Personal Interview, Overall Survey and Sampling Survey , Typical Survey, Capture - Mark - Recapture Method, et al.