Table 3 Comparison of DXA FFM and FFM predicted by other published BIA-based equations in this group of 3-year-old children

From: Prediction of fat-free body mass from bioelectrical impedance and anthropometry among 3-year-old children using DXA

Equation

FFMpred (kg)

Rhoa

Biasb

LOA (kg)

Magnitude of biascβ (SE)

FMcal (kg)

Rhoa

Biasb

LOA (kg)

Fjeld et al.d

11.07

0.87

−0.94*

−2.03;0.14

0.48 (0.05)*

3.36

0.82

0.85*

−0.06;1.75

Kushner et al.d

10.64

0.88

−1.38*

−2.53;−0.22

0.20 (0.08)†

3.80

0.75

1.23*

0.18;2.37

Bedogni et al.d

9.34

0.88

−2.68*

−3.95;−1.41

0.12 (0.09)

5.09

0.73

2.58*

1.33;3.83

Masuda & Komiyad

11.15

0.88

−0.87*

−1.91;0.18

0.10 (0.07)

3.29

0.83

0.77*

−0.14;1.68

Rush et al.

12.23

0.91

0.21*

−0.65;1.08

0.16 (0.06)†

2.21

0.87

−0.31*

−1.06;0.43

  1. aPearson's correlation coefficient.
  2. bPredicted – DXA value. Tested for significance by paired t-test that bias = 0.
  3. cLinear regression model relating differences (FFMpred - FFMDXA) to mean-centered FMDXA.
  4. dPredicted TBW was converted to FFM by the assumption than the age standardized hydration levels of FFM in 3-year-old children is 77.9% for girls and 77.5% for boys11.
  5. *P ≤ 0.001; † P ≤ 0.01.
  6. FFM, Fat-free mass; FM, Fat mass; LOA, Limits of agreement by Blandt Altman.
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