Comparison between FFM and TBW measured by isotope dilution using FTIR and by new BIA equation in the cross-validation sample
| Body composition | New BIA equation, mean±SD | DDM, mean±SD | Bias (95% CI) | P value* | Pure error |
| FFM (kg) | 34.0±7.51 | 33.9±8.28 | 0.09 (−0.46 to 0.65) | 0.743 | 2.68 |
| TBW (kg) | 25.6±5.52 | 25.5±6.14 | 0.06 (−0.36 to 0.48) | 0.773 | 2.01 |
**t-test
BIA, bioelectrical impedance analysis; DDM, deuterium dilution method; FFM, fat-free mass; FTIR, Fourier Transform Infrared Spectrometer; TBW, total body water.