农村女性超重肥胖体质指数与体脂率法评价比较

目的 采用WHO体脂率标准评价中国现行体质指数诊断超重和肥胖标准的准确性。方法 于2013年5-7月横断面调查河北省玉田县648名18~59岁中青年农村女性,采用标准方法测量人体学指标,生物电阻抗法测量体脂率(BF%);体质指数(BMI)参照《中国成人超重和肥胖预防控制指南》,体脂率参照WHO标准。结果 调查对象平均BMI为(24.74±3.97) kg/m²,平均体脂率为(28.54±7.04)%;依据体脂率(>35%)和BMI(≥28.0 kg/m²)标准,调查对象肥胖检出率分别为18.98%和20.06%,差异无统计学意义(P>0.05)。以体脂率30%为超重标准,BMI 24 kg/m²的灵敏度和特异度分别为87.38和79.06%,诊断一致性(Kappa值)为0.66;以体脂率35%为肥胖标准,BMI 28 kg/m²的灵敏度和特异度分别为71.54和92.00%,Kappa值为0.62。BMI与体脂率呈二次曲线关系(R²=0.614,P<0.001)。结论 《中国成人超重和肥胖预防控制指南》推荐的超重和肥胖标准与WHO体脂率超重和肥胖标准的准确度和诊断一致性均较好。

Comparison of body mass index with body fat percentage in evaluation of overweight and obesity among rural adult women

Objective To evaluate the accuracy of body mass index(BMI) applied in China with body fat percentage(BF%) suggested by World Health Organization(WHO) in determining overweight and obesity among rural adult women in Hebei province.Methods From May through July 2013, a total of 648 women aged 18-59 years(mean age:36.7±11.4 years) were included in a cross-sectional survey in Yutian county of Hebei province.BF% was measured using bioelectrical impedance analysis(BIA) and anthropometric indices were measured using standard methods.The BMI criteria adopted by Chinese Adults Overweight and Obesity Prevention and Control Guidelines and WHO BF% were used to define overweight and obesity.Results The mean BMI of study participants was 24.74±3.97 kg/m² and the mean BF% was 28.54±7.04%.According to the criteria of WHO(BF%>35%) and of BMI≥28.0 kg/m², the prevalence of obesity was 18.98 and 20.06%, without significant difference(P>0.05).Compared with the overweight criterion of BF%(>30%), the BMI criterion for overweigh of ≥24 kg/m² showed a good sensitivity(87.38%) and specificity(79.06%), and the diagnostic consistence(Kappa value) was 0.66.Compared with the obesity criterion of BF%(>35%), the BMI criterion for obesity of ≥28 kg/m² had a moderate sensitivity(71.54%) but an excellent specificity(92.00%), and the Kappa value was 0.62.Regression analyses showed that BMI had a good conic correlation with BF%(R²=0.614, P<0.001).Conclusion Compared with the WHO BF% overweight(>30%) and obesity(>35%) criteria, both the overweight(BMI≥24 kg/m²) and obesity(BMI≥28 kg/m²) criteria of BMI present a good accuracy when applied among rural adult women in China.