调查统计数据分析
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·2,447,543篇论文数据，部分数据来源于NoteExpress
Methods Data were from the investigation of Chinese students' physical constitution and health status in 1991 and in 2000. The statistical and comparative analysis was performed.
方法利用1991与2000年中国学生体质与健康调研的结果进行统计检验和比较分析。
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