Validity of Four Commercial Bioelectrical Impedance Scales in Measuring Body Fat among Chinese Children and Adolescents
Table 3
Cross-validation of four BIA devices (embedded equations) for the perdition of %BF/FFM in Chinese children and adolescents.
Gender
BIA devices
%BF-DXA
%BF-BIA
FFM-DXA
FFM-BIA
-test
Bias (SD)
TE
95% limits of agreement
Boys ()
Model A
20.77%
21.34%
—
—
0.268
0.58 (5.86)%
5.86%
0.513
−10.96% to 12.12%
Model B
20.77%
21.92%
—
—
0.031
1.15 (5.95)%
6.04%
0.528
−10.51% to 12.81%
Model C
20.77%
19.04%
—
—
<0.001
−1.67 (4.80)%
5.06%
0.162
−11.08% to 7.74%
Model D
20.77%
20.22%
—
—
0.246
−0.37 (3.51)%
3.51%
0.365
−7.25% to 6.51%
Model A
—
—
43.02 kg
43.80 kg
0.019
0.78 (3.70) kg
3.77 kg
0.261
−6.47 kg to 8.03 kg
Model B
—
—
43.02 kg
43.18 kg
0.608
0.16 (3.60) kg
3.60 kg
−0.027
−6.90 kg to 7.22 kg
Model C
—
—
43.02 kg
44.50 kg
<0.001
1.54 (3.35) kg
3.60 kg
0.024
−5.03 kg to 8.11 kg
Model D
—
—
43.02 kg
44.31 kg
<0.001
1.02 (2.17) kg
2.39 kg
0.197
−3.23 kg to 5.27 kg
Girls ()
Model A
27.85%
27.37%
—
—
0.266
−0.48 (4.88)%
4.88%
0.359
−10.04% to 9.08%
Model B
27.85%
25.22%
—
—
<0.001
−2.63 (3.23)%
4.15%
−0.049
−8.96% to 3.70%
Model C
27.85%
25.81%
—
—
<0.001
−2.05 (3.21)%
3.79%
0.012
−8.34% to 4.24%
Model D
27.85%
26.34%
—
—
<0.001
−1.47 (2.99)%
3.31%
−0.147
−7.33% to 4.39%
Model A
—
—
32.77 kg
33.89 kg
<0.001
1.11 (2.42) kg
2.66 kg
0.245
−3.63 kg to 5.85 kg
Model B
—
—
32.77 kg
34.74 kg
<0.001
1.97 (1.77) kg
2.64 kg
−0.255
−1.50 kg to 5.44 kg
Model C
—
—
32.77 kg
34.49 kg
<0.001
1.72 (1.77) kg
2.47 kg
−0.219
−1.75 kg to 5.19 kg
Model D
—
—
32.77 kg
34.03 kg
<0.001
1.25 (1.22) kg
1.68 kg
−0.022
−1.14 kg to 3.64 kg
Note: %BF: body fat percentage; FFM: fat-free mass; DXA: dual-energy X-ray absorptiometry; BIA: bioelectrical impedance analysis. Bias: value obtained from BIA measurement minus DXA measurement; SD: standard deviation. , Pearson’s correlation coefficient for the relationship between averaged %BF/FFM [(value of DXA + value of BIA)/2] and the bias. ; . Model A: Biodynamics-310; Model B: Tanita TBF 543; Model C: Tanita BC-545; Model D: Inbody 520.
