大学生体重指数影响因素分析

Analysis of the influencing factors of BMI among college students

目的找出大学生体重指数(body mass index,BMI)的影响因素,为进一步保持大学生健康体重采取干预措施提供依据。方法对某高校大学生的2012年体质健康测试数据进行分析,主要是将大学生的身高、体重数据及相应的BMI与相关因素进行Logistic回归分析。本研究采取SAS9.1进行统计分析。结果 Logistic回归分析发现,变量x1(性别)的回归系数的Wald卡方值为22.925 3(P<0.05),其OR=0.710;变量x2(民族)的回归系数的Wald卡方值为20.025 4(P<0.05),其OR=0.696;变量x5(年级)的回归系数的Wald卡方值为62.339 4(P<0.05),其OR=1.512,所以变量x1、x2、x5对大学生的BMI有影响。而变量x3(年龄)、x4(系别)的回归系数的Wald卡方检验的P>0.05,对大学生的BMI无影响。进一步分析发现,变量x1、x2、x5对BMI的影响主要表现在体重正常组,体重正常组不同性别学生BMI秩和检验P<0.05(男生21.10 kg/m2,女生20.73 kg/m2),体重正常组不同民族学生BMI秩和检验P<0.05(汉族20.74 kg/m2,少数民族21.22 kg/m2),体重正常组不同年级学生BMI秩和检验P<0.05(2010级20.50 kg/m2,2011级20.84 kg/m2,2012级20.92 kg/m2)。结论为保持大学生的健康体重,需要加强大学生的健康教育,使其养成正确的健康观,同时加强高校食堂的营养学知识水平和建立科学的学生体质监控体系也是必要的。

Objective To find out the influencing factors of BMI among college students, so as to provide the basis for fur- ther interventions to maintain a healthy weight among college students. Methods We analyzed the data of physique fitness test for students of a college in 2012. Logistic regression analysis was conducted on the data of height, weight, BMI and related factors. The statistical analysis was made by the software SASg. 1. Results Logistic regression analysis showed that the Wald chi - square value of the regression coefficients of the variables xl （sex） was 22.9253（ P 〈0.05） ,OR =0. ＂/10; the Wald chi -square value of the regression coefficients of the variables x2 （nationality） was 20.025 4 （P 〈 0.05）, OR = 0. 696 ; the Wald chi - square value of the regression coefficients of the variables x5 （grade） was 62. 339 4（ P 〈 0.05 ）, OR = 1. 512. The variables of xl, x2, x5 had influence on BMI, while the variables of x3 and x3 had not for the P values of the regression coefficients of the variables x3 （age）, x4 （department） were more than 0.05 by using Wald chi -square test. Further analysis showed that the impacts of variables of xl, x2 and x5 on BMI were mainly found in the normal weight group, the P value of Wilcoxon rank sum test of BMI between male students and female students in the normal weight group was less than 0.05 （ male 21.10 kg/m2, female 20.73 kg/m2 ）, the P value of Wilcoxon rank sum test of BMI between students of Han nationality and minority students in the normal weight group was less than 0.05 （ Han 20.74 kg/m2, minor- ity 21.22 kg/m2 ）, the P value of Wilcoxon rank sum test of BMI among students from different grades in the normal weight group was less than 0. 05 （ grade 2010 20. 50 kg/m2 , grade 2011 20. 84 kg/m2, grade 2012 20. 92 kg/m2 ）. Conclusions To keep the healthy weight of college students, health education should be strengthened, so that correct views of health can developed among them. It is also necessary to improve the level of nutrition knowledge of college canteens and to establish a scientific physique monitoring system of students.