四川省20-69岁人群BMI及百分位研究

Study on the BMI and Percentile among People Aged Between 20 and 69 in Sichuan Province

目的:探究四川省20-69岁人群BMI特点,探索用百分位数法评价BMI。方法:取2005年四川省国民体质监测中成年、老年31 477人的BMI指数进行统计和曲线拟合。结果:四川省20-69岁人群总体、男子、女子BMI为22.80±3.06、23.05±2.99、22.55±3.11kg/m2。BMI分层统计体重偏轻、正常、超重、肥胖的百分比,男子为5.1、58.8、30.6、5.5,女子为7.1、63.3、24.1、5.5;不同性别在体重偏轻、正常、超重的百分比差异有统计学意义(p<0.01)。曲线拟合显示男子BMI从20岁到30岁快速增长,30岁以后保持稳定,女子BMI从20岁缓慢增长,直到54岁趋于稳定。超重和肥胖的触发年龄男子为21岁、28岁,女子为31岁、41岁;BMI峰值年龄为男子45岁、女子58岁。结论:BMI分层、触发年龄、BMI峰值年龄有性别差异。用百分位数进行BMI评价可反映群体资料中BMI动态变化,亦可准确反映个体在群体中的位置。

Objective： This research aims at studying the BMI characteristics for people aged between 20 and 69 in Sichuan province and experimenting with using the percentile method to evaluate BMI. Methods： BMI index of 31477 persons among those whose physique was monitored in Sichun province in 2005 is studied by means of statistics and the curve - fitting method. Results ： BMI for the group in general, the male group and female group is 22.80 ±3.06, 23.05 ±2.99, 22.55 ± 3.11 kg/nf respectively. The percentage for people of underweight, normal weight, and overweight through BMI stratified statistics is respectively 7.7, 58.8, 30.6 and 5.5 for men and 7.1, 63.3, 24.1 and 5.5 for women. There are significant difference （ p 〈 0. 01 ） between men and women in the percentage of underweight, normal weight and overweight. Curve - fitting shows that BMI index increases sharply in men from 20 to 30 and maintains stability after 30, while BMI index increases slowly in women from 20 on and becomes stabile until 54. The age for likely overweight and obesity is 21 and 28 for men but 31 and 41 for women. The age for BMI peak value is 45 for men and 58 for women. Conclusion ： There are sex difference in BMI stratification, age of likely obesity, and age for BMI peak value. Using percentile to evaluate BMI can reflect the dynamic change in group data and accurately reflect the position of individual in the group.