Comparison of consistency in measurement of body fat percentage by dual-energy X-ray ;absorptiometry and multi-frequency bioelectrical impedance analysis in overweight and obese ;adults in China / 中华流行病学杂志

ABSTRACT

Objective 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. Methods 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. Results 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 includedPBF(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. Conclusion 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.