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 | p t-test | Bias (SD) | TE | r y−y′,y | 95% limits of agreement |
|---|---|---|---|---|---|---|---|---|---|---|
| Boys (n = 127) | 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 (n = 128) | 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.
r y−y′,y, Pearson's correlation coefficient for the relationship between averaged %BF/FFM [(value of DXA + value of BIA)/2] and the bias.
∗ p < 0.05; ∗∗ p < 0.01.
Model A: Biodynamics-310; Model B: Tanita TBF 543; Model C: Tanita BC-545; Model D: Inbody 520.