Validation of bioelectrical impedance analysis in measuring body composition of children aged from 3 to 6 / 中华实用儿科临床杂志

ABSTRACT

Objective:To examine the concordance between bioelectrical impedance analysis (BIA) and dual energy X-ray absorptiometry (DXA) in determining body composition of children aged between 3 and 6.Methods:A total of 230 children aged 3-6 from a kindergarten in Jinnan, Tianjin were enrolled in this study from November 16 th to December 8 th, 2017.The soft lean mass (SLM) and the body fat mass (BFM) of the children were measured by using BIA and DXA.The children were divided into several groups by sex, age and body mass index (BMI). The consistency of the body composition results between BIA and DXA in each group was analyzed. Results:The SLM and BFM assessed by BIA were significantly correlated with those measured by DXA ( R2=0.951, 0.947, all P<0.001). The Bland-Altman plots suggested that the SLM measured by BIA was 0.70 kg(95% CI -1.78-0.38) higher in that by DXA, and the BFM measured by BIA was 1.36 kg (95% CI 0.19-2.52) lower in that by DXA.A similar trend could be seen in children stratified by age, sex and BMI.The SLM of boys and girls measured by BIA was 0.57 kg (95% CI -1.63-0.49) and 0.84 kg (95% CI -1.88-0.20) higher than those by DXA, respectively.The BFM of boys and girls measured by BIA was 1.23 kg (95% CI 0.11-2.36) and 1.49 kg (95% CI 0.34-2.64) lower than that by DXA, respectively.The SLM measured by BIA was 0.67 kg (95% CI -1.74-0.41), 0.76 kg (95% CI -1.65-0.13), 0.69 kg (95% CI -1.85-0.47) and 0.67 kg (95% CI -1.75-0.41) higher than those by DXA in the 3 to 6-year-old groups, respectively.The BFM measured BIA was 1.09 kg (95% CI -0.12-2.30), 1.44 kg (95% CI 0.60-2.28), 1.39 kg (95% CI 0.15-2.64)and 1.43 kg(95% CI 0.38-2.48)lower than that by DXA in the 3 to 6-year-old groups, respectively.Moreover, the smallest difference of the SLM and BFM were observed between BIA and DXA in the obese child.The SLM deviation between BIA and DXA was estimated within ± 0.39 kg and the BFM deviation was within ± 0.93 kg. Conclusions:There is high consistency between BIA and DXA in the assessment of the SLM and BFM of children aged from 3 to 6.