南昌市高中生体重自我评价与BMI分类一致性分析

Consistency between self-evaluation of body weight and BMI category among senior high school students in Nanchang city

目的了解江西省南昌市高中生体质指数(BMI)分类及体重自我评价现况及两者一致性情况,探讨体重自我评价对行为的影响,为建立青少年正确的自我评价开展相应的健康教育奠定基础。方法于2015年6月采取分层整群随机抽样法抽取南昌市5所学校884名学生,调查高中生的主要健康危险行为,分析BMI分类与体重自我评价的关系。结果被调查884名高中生中,52.38%体重自我评价与BMI分类一致,26.24%高估了自己的体重,21.38%低估了自己的体重。体重自我评价与BMI分类一致性不同的高中生计划采取的行为有统计学差异(χ^2=239.019,P<0.001)。多元无序logistic回归分析显示,对体重计划采取减肥与高估呈正性相关(OR=4.972,P<0.001),与低估呈负性相关(OR=0.234,P<0.001);女性更容易高估自己的体重(OR=2.369,P<0.001)。结论青少年正确的体重自我评价对其生长发育具有重要意义,正确自我评价体型可以促使良好饮食习惯的培养和运动,而错误的自我认知可能导致不科学的减肥行为,应对此展开健康教育工作。

Objective To examine the distribution of body mass index(BMI),the consistency between self-evaluation of body weight and BMI category and to explore the impact of the self-evaluation on relevant behaviors among senior high school students in Nanchang city of Jiangxi province for providing evidences for the development of targeted health education on correct self-evaluation of body weight in the students.Methods We conducted a self-administered anonymous questionnaire survey among 884 senior high school students recruited in 5 high schools with stratified random cluster sampling in Nanchang city during June 2015.Youth Risk Behavior Surveillance System(YRBSS)was adopted to collect information on main health risk behaviors and BMI was calculated based on self-reported height and weight among the students.Results Of all the respondents,52.38%reported the self-evaluated body weight in line their BMI categories;26.24%overestimated their body weight;and 21.38%underestimated their body weight.There was a statistically significant difference in planned body weight control behaviors in the respondents reporting the body weight inconsistent with their BMI categories(χ^2=239.019,P<0.001).Multivariate nonordinal logistic regression analysis demonstrated that planned weight loss was correlated positively with overestimated body weight(odds ratio[OR]=4.972,P<0.001)but inversely with underestimated body weight(OR=0.234,P<0.001)and the female respondents were more likely to overestimate their body weight(OR=2.369,P<0.001).Conclusion Correct self-evaluation of body weight is of great significance for growth and development in adolescents.Correct self-evaluation of somatotype is beneficial to promote healthy dietary and physical exercise behavior;while,inaccurate self-evaluation of somatotype could lead to improper weight loss practice in the adolescents.