Table 3.
Estimations of FFM and LST obtained with different equations and mean differences compared with DXA
| Equation | FFM or LST estimation | Mean difference and 95% CI (DXA-prediction) | P | Effect size | r/r2 | SEE/MAE (kg) | ICC (95% CI) |
|---|---|---|---|---|---|---|---|
| Equations used to estimate FFM | |||||||
| FFM from DXA: 59.01 ± 12.07 kg | |||||||
| Equations only using weight, age, sex, or BMI | |||||||
| Gallagher et al. (2000)27 | 58.42 ± 14.23 | 0.60 (–0.33 to 1.52) | 0.206 | 0.110 | 0.935*/0.874 | 4.30/4.15 | 0.92 (0.90 to 0.94) |
| Janmahasatian et al. (2005)29 | 57.55 ± 11.37 | 1.46 (0.73 to 2.19) | < 0.001 | 0.360 | 0.940*/0.884 | 4.12/3.50 | 0.93 (0.90 to 0.95) |
| Larsson et al. (2006)24 | 57.99 ± 12.89 | 1.02 (0.25 to 1.80) | 0.010 | 0.230 | 0.941*/0.886 | 4.09/3.69 | 0.94 (0.91 to 0.95) |
| Li et al. (2019)23 | 59.51 ± 11.84 | –0.50 (–1.21 to 0.21) | 0.167 | –0.130 | 0.944*/0.890 | 3.99/3.35 | 0.92 (0.78 to 0.96) |
| Li et al. (2019)23 (higher BMI) | 59.01 ± 11.45 | 0.01 (–0.74 to 0.74) | 0.998 | 0.001 | 0.940*/0.883 | 4.14/3.42 | 0.94 (0.92 to 0.95) |
| Equations using the above parameters plus hip or waist circumference | |||||||
| Larsson et al. (2006)24 | 50.05 ± 9.22 | 9.01 (6.17 to 11.85) | < 0.001 | 0.570 | 0.086/0.007 | 12.11/11.12 | 0.00 (–0.11 to 0.12) |
| Equations used to estimate LST | |||||||
| LST from DXA: 56.62 ± 11.74 kg | |||||||
| Equations only using weight, age, sex, or BMI | |||||||
| Lee et al. (2017)28 | 59.55 ± 13.07 | –2.93 (–3.68 to –2.17) | < 0.001 | –0.690 | 0.948*/0.898 | 3.77/4.09 | 0.92 (0.89 to 0.94) |
| Yu et al. (2013)31 | 52.98 ± 12.89 | 3.64 (2.80 to 4.48) | < 0.001 | 0.770 | 0.931*/0.867 | 4.31/4.87 | 0.89 (0.70 to 0.94) |
| Kulkarni et al. (2013)30 | 62.76 ± 12.88 | –6.14 (–6.87 to –5.41) | < 0.001 | –1.500 | 0.949*/0.900 | 3.72/6.30 | 0.84 (0.16 to 0.94) |
| Equations using the above parameters plus hip or waist circumference | |||||||
| Lee et al. (2017)28 | 59.78 ± 13.18 | –3.11 (–3.85 to –2.37) | < 0.001 | –0.750 | 0.951*/0.904 | 3.65/4.16 | 0.92 (0.78 to 0.96) |
| Salamat et al. (2015)25† | 57.70 ± 8.47 | 0.03 (–1.35 to 1.40) | 0.971 | 0.001 | 0.877*/0.769 | 6.00/5.11 | 0.81 (0.76 to 0.86) |
Values are presented as mean±standard deviation unless otherwise indicated.
*P<0.05 for the correlation coefficients; †For this equation (n=88).
FFM, fat-free mass; LST, lean soft tissue; DXA, dual-energy X-ray absorptiometry; CI, confidence interval; r, Pearson correlation coefficient; r2, coefficient of determination; SEE, standard error of the estimate; MAE, mean absolute error; ICC, intraclass correlation coefficient; BMI, body mass index.