Table 4.
Values of the desirable reproducibility index (DRI) for defining agreement between the DXA reference method and the proposed equations.
| Equations | X | SD | Min | Max | Desirable reproducibility index | ||
|---|---|---|---|---|---|---|---|
| CCC | p | A | |||||
| MALES | |||||||
| DXA Reference LM | 38.7 | 14.4 | 11.4 | 71.8 | – | – | – |
| Equation 1 | 38.7 | 13.4 | 6.1 | 67.5 | 0.9337 (IC:0.9266 to 0.9401) | 0.936 | 0.998 |
| Equation 2 | 38.7 | 13.4 | 5.3 | 67.0 | 0.9334 (IC:0.9263 to 0.9398) | 0.936 | 0.998 |
| FEMALES | |||||||
| DXA Reference LM | 29.7 | 9.1 | 0.3 | 55.9 | – | ||
| Equation 3 | 29.7 | 8.3 | 7.9 | 52.2 | 0.9084 (IC:0.8961 to 0.9193) | 0.912 | 0.996 |
| Equation 4 | 31.0 | 9.1 | 8.7 | 56.1 | 0.9008 (IC:0.8874 to 0.9128) | 0.909 | 0.991 |
LM, Muscle mass (lean mass); CCC, Correlation coefficient of agreement; P, Precision; A, Accuracy; SD, Standard deviation; Min, Minimum; Max, Maximum; CI, Confidence interval; and DXA, double energy X-ray absorptiometry.