Wang Zhenghe, Fu Lianguo, Yang Yide, Wang Shuo, Ma Jun
School of Public Health and Institute of Child and Adolescent Health, Peking University, Beijing 100191, China.
Department of Preventive Medicine, Bengbu Medical College.
Zhonghua Liu Xing Bing Xue Za Zhi. 2015 Jul;36(7):701-4.
To compare the consistency in the measurement of percentage of body fat (PBF) by multi-frequency bioelectrical impedance analysis (MF-BIA) and dual energy X-ray absorptiometry (DXA) in overweight and obese adults in China, and provide evidence for the accurate MF-BIA application in China.
A total of 1 323 overweight/obese adults aged 22-55 years were recruited in this study. All the subjects received PBF measurement by both MF-BIA and DXA. The consistency in PBF measurement by MF-BIA and DXA was evaluated by using interclass correlation coefficients (ICC), then the correction prediction models was established.
The differences in PBF measurement in male subjects and female subjects between MF-BIA and DXA were statistical significant (all P < 0.01), the mean difference values were -6.5% for overweight males and -4.3% for obese males, -2.5% for overweight females and 0.5% for obese females, respectively. The difference in ICC of PBF between MF-BIA and DXA measurement were statistically significant in all subgroups (P < 0.01). The ICC was 0.746 for overweight males, 0.807 for obese males, 0.628 for overweight females and 0.674 for obese females, respectively. The correction prediction models included: PBF (DXA) = 13.425 + 0.719 × PBF (MF-BIA) for overweight males; PBF (DXA) = 12.572 + 0.741 × PBF (MF-BIA) for obese males; PBF (DXA) = 9.785 + 0.802 × PBF (MF-BIA) for overweight females; PBF (DXA) = 20.348 + 0.532 × PBF (MF-BIA) for obese females.
The consistency in PBF measurement in overweight/obese adults by MF-BIA and DXA was poor in China. Correction should be conducted when MF-BIA is used in the measurement of PBF.
比较多频生物电阻抗分析（MF-BIA）与双能X线吸收法（DXA）测量中国超重和肥胖成年人身体脂肪百分比（PBF）的一致性，为MF-BIA在中国的准确应用提供依据。
本研究共纳入1323名年龄在22至55岁的超重/肥胖成年人。所有受试者均接受了MF-BIA和DXA两种方法的PBF测量。采用组内相关系数（ICC）评估MF-BIA和DXA测量PBF的一致性，然后建立校正预测模型。
MF-BIA与DXA测量男性和女性受试者PBF的差异均具有统计学意义（均P<0.01），超重男性的平均差值为-6.5%，肥胖男性为-4.3%，超重女性为-2.5%，肥胖女性为0.5%。MF-BIA与DXA测量PBF的ICC差异在所有亚组中均具有统计学意义（P<0.01）。超重男性的ICC为0.746，肥胖男性为0.807，超重女性为0.628，肥胖女性为0.674。校正预测模型包括：超重男性：PBF（DXA）=13.425+0.719×PBF（MF-BIA）；肥胖男性：PBF（DXA）=12.572+0.741×PBF（MF-BIA）；超重女性：PBF（DXA）=9.785+0.802×PBF（MF-BIA）；肥胖女性：PBF（DXA）=20.348+0.532×PBF（MF-BIA）。
在中国，MF-BIA与DXA测量超重/肥胖成年人PBF的一致性较差。使用MF-BIA测量PBF时应进行校正。
