摘要
【目的】比较重庆市正常体重学生和超重学生的体脂推算值,分析体质指数(body mass index,BMI)和体脂百分比(percent body fat,PBF%)的相互关系,探讨不同肥胖筛查标准的一致性,为国内儿童肥胖判断标准的完善提供线索。【方法】以WHO的身高别体重(WFH)标准筛出超重学生844名,并按1:2配对选择了正常体重学生1688名。通过测量学生的身高、体重、肱三头肌和肩胛下皮褶厚度,计算BMI,并推算PBF。【结果】1)7~18岁每个年龄段的超重男生和女生的BMI均值和PBF中位数均分别显著高于同龄正常体重的男生和女生的对应值(P均〈0.001);2)PBF与BMI的偏相关系数r为0.397(P〈0.001)。多元线性回归分析显示:PBF与性别(男=1,女=2)、BMI正相关,与是否超重(超重=1,正常=2)、年龄负相关(R2=0.578,P〈0.001);3)与中国肥胖工作组WGOC公布的BMI切点标准相比,协作组推荐的PBF判断标准的特异度为83.0%,灵敏度为82.9%。【结论】重庆城区超重学生和正常学生的脂肪推算值差异显著。PBF受多种因素影响,与BMI呈低度相关。直接测量学生的体内脂肪,建立本国的PBF筛查标准,联合BMI切点标准可能更有利于学生肥胖的准确诊断。
[Objective] To reflect the body fat content by using body mass index (BMI) and percentage body fat (PBF%) calculated between the overweight students and normal weight students aged 7 - 18 years living in urban Chongqing, and analyze the relation of BMI and PBF in the students , and explore the consistence of different overweight standards, so as to provide some clues for improving the diagnose level of student overweight. [Methods] According to the weight for height standard from WHO(WFH), 844 overweight students and 1 688 healthy weight children (matched with 1 : 2) were recruited for this study, whose weight, height, triceps skinfold and subseapular skinfold were measured with international authropometry. The body fat percent (PBF%) and the BMI were calculated. [ Results] 1 )The BMI mean and PBF% median in overweight girls and boys aged 7-18 years were significantly higher than those in normal weight girls and boys at the same age respectively(P〈 0. 001). 2)BMI was found closely correlated with PBF% in the students when age, sex and group were controlled (r = 0. 397, P〈0. 001 ). Moreover, linear regression analysis revealed that sex (male= 1, female= 2)and BMI were significantly positively correlated with PBF%, while age and group(overweight = 1, normal=2) negatively with PBF%(R2 =0. 578,P〈0. 001). 3) Compared with the BMI cutoff values of Working Group on Obesity in China (WGOC) ,the specificity and sensitivity of the PBF cutoff values was 83.0% and 82.9%. [Conclusions] There are significant differences in body fat content calculated of overweight students and normal weight students and there is the low correlation between BMI and PBF%. To measure body fat directly and establish Chinese student PBF overweight screening standard and combine the BMI cutoff values may be contribute to improve thediagnose level of overweight screening.
出处
《中国儿童保健杂志》
CAS
2010年第3期213-215,218,共4页
Chinese Journal of Child Health Care
关键词
超重
体质指数
皮褶厚度
体脂百分比
overweight
body mass index
skinfold
percent body fat