Methods: With cluster sampling method, anthropometric data were obtained from 1 697 middle school students of the Han and the Korean nationalities in Yanbian area.
方法：采用整群抽样方法，对延边地区朝、汉族初中、高中学生1 697名体格指标进行了调查。
Methods: With cluster sampling method, anthropometric data were obtained from 1 697 middle school students of the Han and the Korean nationalities in Yanbian area.
方法：采用整群抽样方法，对延边地区朝、汉族初中、高中学生1 697名体格指标进行了调查。
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