Table 2.
Body composition parameters determined by dual-energy x-ray absorptiomtry, in-built Tanita BIA 8 equations, and published equations
| Method | DXA | Tanita BIA 8 | Ramirez et al. [ [11]] | Bray et al. [ [12]] | Jaffrin et al. [ [14]] |
|---|---|---|---|---|---|
| Fat-free mass kg | |||||
| Mean ± SD (kg) | 47.4 ± 11.7 | 51.7 ± 12.1a | 48.0 ± 11.1 | 47.8 ± 9.8 | 48.3 ± 11.5 |
| Bias (kg) | 4.3 | 0.6 | 0.4 | 0.9 | |
| Limits of agreement (kg) | -5.3 to 13.9 | -7.1 to 8.2 | -7.6 to 8.4 | -6.2 to 8.0 | |
| r c (95% CI)b | 0.86 (0.79 – 0.91) | 0.94 (0.90 – 0.96) | 0.93 (0.89– 0.6) | 0.95 (0.92 – 0.97) | |
| Fat mass kg | |||||
| Mean ± SD (kg) | 41.8 ± 12.1 | 37.5 ± 13.0a | 41.2 ± 11.5 | 41.3 ± 12.2 | 40.9 ± 11.6 |
| Bias (kg) | -4.3 | -0.6 | -0.5 | -0.9 | |
| Limits of agreement (kg) | -13.9 to 5.3 | -8.2 to 7.1 | 8.4 to -7.6 | 8.0 to -6.2 | |
| r c (95% CI)b | 0.87 (0.81 – 0.92) | 0.94 (0.91 – 0.96) | 0.94 (0.91 – 0.96) | 0.95 (0.92 – 0.97) | |
| Percentage of body fat | |||||
| Mean ± SD (%) | 46.4 ± 7.4 | 41.4 ± 8.3a | 45.8 ± 5.5 | 45.7 ± 5.2 | 45.6 ± 6.0 |
| Bias (%) | -5.0 | -0.6 | -0.5 | -0.8 | |
| Limits of agreement (%) | -15.1 to 5.0 | -9.1 to 7.9 | -9.2 to 8.0 | -9.2 to 7.4 | |
| r c (95% CI)b | - | 0.65 (0.53 – 0.75) | 0.77 (0.67 - 0.85) | 0.76 (0.65 – 0.83) | 0.79 (0.69 – 0.86) |
adifference between DXA and Tanita BIA8, P <0.001.
bCI: confidence interval.