Consistency between bioelectrical impedance analysis and dual-energy X-ray absorptiometry in body composition measurement in children aged 6-17 years in China
Objective To evaluate the consistency between bioelectrical impedance analysis(BIA)and dual-energy X-ray absorptiometry(DXA)in the measurement of body composition in children aged 6-17 years in China.Methods Fat-free mass,fat mass and fat mass percentage were measured by both BIA and DXA in 1 161 children.t-test or Wilcoxon paired test was used to evaluate the different outcome of the two methods.The correlation and consistency between the methods were evaluated by Spearman correlation coefficients(r)and Bland-Altman analysis.Results Body compositions measured by BIA was positively correlated with those measured by DXA(fat mass r=0.95,fat-free mass r=0.98,fat mass percentage r=0.86,all P＜0.05).Comparing with DXA,BIA underestimate children's fat mass[the mean difference is-3.15 kg,and the SD is 2.35 kg,95％limits of agreement(LoA):-7.74-1.45 kg]and fat mass percentage(the mean difference is-8.45％,and the SD is 4.63％,95％LoA:-17.53％-0.64％).Conclusions Body compositions measured by BIA was highly positively correlated with those measured by DXA.BIA has certain application value in the measurement of body fat mass and fat-free mass of children aged 6-17 years.
Bioelectrical impedance analysisDual-energy X-ray absorptiometryBody compositionFat massFat-free massFat mass percentage
万方数据
维普
