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采用主成分分析法对反映身体发育的１３项指标进行了分析，提取出前四个主成分，结果发现第一主成分反映总体发育状况；第二主成分反映身体发育的充实度；第三主成分在男生中反映身体发育的比例关系，在女生中反映肺功能；第四主成分在男生中反映肺功能，在女生中反映体脂的发育状况。用提取出的四个主成分作变量与三项素质指标做逐步回归分析，所得方程均有意义。
The principal components analysis was used to analyze the 13 indicators reflecting body development and the first four principal components were extracted. The results showed that the first principal component reflected the overall development status; the second principal component reflected the fullness of physical development; the third principal component. The proportion of physical development was reflected in boys, and lung function was reflected in girls. The fourth principal component reflected lung function in boys and reflected the development of body fat in girls. Using the four principal components extracted as variables and three quality indicators to do stepwise regression analysis, the resulting equations are all meaningful.