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文章运用曲线拟合的方法,将全国和山西省城市汉族7~22岁男学生各年龄段断面的身高数据拟合转换为纵向连续资料,选取最佳曲线拟合模型,对比分析揭示内部变化规律。发现山西与全国城市汉族7~22岁男学生身高均值与生长速度变化趋势一致,均在7~9岁和10~12岁身高进入生长突增期,13~19岁增长速度缓慢下降,20岁趋于稳定后身高均值有随年龄增长而降低趋势。全国与山西省增长速度曲线在6岁和15岁时两次交叉。
The article uses the method of curve fitting to convert the height data of each age section of Han nationality aged from 7 to 22 in Han nationality of Shanxi province and Shanxi Province to the longitudinal continuous data. The best curve fitting model is selected and the internal variation rule . Found that the average height and growth rate of male students between 7 and 22 years old in Shanxi and the national cities of China were all in the same trend. All of them were in the age of 7 to 9 and 10 to 12 years old and entered the stage of sudden growth. The growth rate of 13 to 19 years old decreased slowly, After stabilization, the mean value of height decreases with age. The growth rate curve across the country and Shanxi Province crosses twice at the age of 6 and 15.