Methods: The variables were subjected to SPSS11.0 for Windows by multi-factor analysis of variance and cluster analysis.
方法：运用sPSS11。0统计分析软件对所取变量进行多因素方差分析和聚类分析。
Methods: The variables were subjected to SPSS11.0 for Windows by multi-factor analysis of variance and cluster analysis.
方法：运用sPSS11。0统计分析软件对所取变量进行多因素方差分析和聚类分析。
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