不同性别、民族健康成年人体质量指数与体脂百分比的相关性及应用评价

The correlation between body mass index and percentage body fat in people of different gender and nationality and their application assessment

目的探讨不同性别、民族人群体质量指数(BMI)与体脂百分比(PBF)之间的相关关系及两个指标对于肥胖症诊断的价值。方法对925例汉族和维吾尔族健康成年人进行体格检查,通过使用生物电阻抗技术测得体质量和PBF,计算BMI,分析不同民族、性别人群中BMI与PBF间的相关关系。结果在BMI分型为正常和超重的人群中,汉族男性PBF均高于维吾尔族男性PBF(P<0.05);偏瘦、超重和肥胖的汉族女性PBF均高于维吾尔族女性(P<0.05)。不同性别、民族的人群中PBF与BMI均呈正相关(P<0.05)。以BMI≥28kg/m2为诊断肥胖的金标准,两个民族人群采用PBF诊断肥胖均有良好的灵敏度及较低的特异度。结论在相同的BMI分型中,汉族的PBF普遍高于维吾尔族。BMI和PBF对于肥胖的诊断存在一定的不均衡性,评价肥胖不能单纯依靠BMI,可与PBF相结合。

Objective To analyze the correlation between body mass index（BMI）and percentage body fat（PBF）in people of different nationality and gender,and assess the value of BMI and PBF in the diagnosis of obesity.Methods A total of 925 healthy adults who underwent physical examination in the hospital were enrolled in the study,bioelectrical impedance measurement was used to measure the weight,PBF,then analyze the correlation between BMI and PBF in people of different nationality and gender.Results In the normal and overweight population classified by BMI,;In underweight,overweight and obesity people,PBF of Han women were higher than that of Uighur women（P〈0.05）.In people of different gender and ethnic group,PBF was positively correlated with BMI（P〈0.05）.Using BMI≥28kg/m2 as gold standard for the diagnosis of obesity,PBF have good sensitivity and low specificity for the diagnosis of obesity in both of the two ethnic groups.Conclusion Compared with Uygur,Han have higher PBF at the same level of BMI.There is a malconformation between BMI and PBF.Evaluation of obesity could not simply rely on BMI,and should be analyzed combined with PBF.