Table 2 Fat mass, fat-free mass, percentage of body fat, lean body mass, bone mineral contents, and body mass by BIA and DXA.

From: Similarities and discrepancies between commercially available bioelectrical impedance analysis system and dual-energy X-ray absorptiometry for body composition assessment in 10–14-year-old children

 

BIA

DXA

CE (95% CI)

SEE

MD

Boys (n = 226)

 FM (kg)

7.6 ± 6.2

7.9 ± 4.4

− 0.28 ± 2.37 (− 0.59, 0.03)

1.284

1.36

 FFM (kg)

35.7 ± 7.6

35.7 ± 8.8

0.07 ± 2.01 (− 0.19, 0.34)

1.704

0.77

 PBF (%)

16.0 ± 8.3

17.6 ± 6.1*

− 1.57 ± 4.47 (− 2.16, − 0.99)

3.207

4.75

 LBM (kg)

33.9 ± 7.1

34.5 ± 8.5*

− 0.63 ± 2.08 (− 0.90, − 0.35)

1.681

0.82

 BMC (kg)

1.8 ± 0.5

1.1 ± 0.3*

0.70 ± 0.20 (0.68, 0.73)

0.115

0.15

 BM (kg)

43.3 ± 11.9

43.6 ± 11.5*

− 0.21 ± 0.48 (− 0.27, − 0.14)

0.310

0.00

Girls (n = 217)

 FM (kg)

9.4 ± 4.2

9.4 ± 3.6

0.01 ± 1.24 (− 0.16, 0.17)

0.963

0.66

 FFM (kg)

32.8 ± 4.5

33.1 ± 5.2*

− 0.36 ± 1.09 (− 0.51, − 0.21)

0.918

0.38

 PBF (%)

21.4 ± 5.9

21.5 ± 4.9

− 0.18 ± 2.81 (− 0.55, 0.20)

2.321

2.70

 LBM (kg)

30.9 ± 4.2

32.0 ± 5.0*

− 1.11 ± 1.15 (− 1.27, − 0.96)

0.904

0.41

 BMC (kg)

1.9 ± 0.3

1.1 ± 0.3*

0.76 ± 0.17 (0.74, 0.78)

0.119

0.16

 BM (kg)

42.2 ± 8.1

42.5 ± 7.9*

− 0.35 ± 0.32 (− 0.39, − 0.31)

0.263

0.03

All (n = 443)

 FM (kg)

8.5 ± 5.4

8.6 ± 4.1

− 0.14 ± 1.91 (− 0.32, 0.04)

1.187

1.10

 FFM (kg)

34.3 ± 6.4

34.4 ± 7.4

− 0.14 ± 1.64 (− 0.29, 0.14)

1.433

0.63

 PBF (%)

18.6 ± 7.7

19.5 ± 5.9*

− 0.89 ± 3.81 (− 1.25, − 0.53)

2.830

3.70

 LBM (kg)

32.4 ± 6.0

33.3 ± 7.1*

− 0.87 ± 1.7 (− 1.02, − 0.71)

1.440

0.69

 BMC (kg)

1.9 ± 0.4

1.1 ± 0.3*

0.73 ± 0.19 (0.71, 0.75)

0.117

0.16

 BM (kg)

42.8 ± 10.2

43.1 ± 9.9*

− 0.28 ± 0.42 (− 0.32, − 0.24)

0.295

0.00

  1. Data are means ± standard deviations.
  2. BIA, bioelectrical impedance analysis; DXA, dual energy X-ray absorptiometry; CE, constant error (BIA minus DXA value); CI, confidence interval; SEE, standard error of estimate; MD, minimum difference; FM, fat mass; FFM, fat-free mass; PBF, percentage of body fat; LBM, lean body mass; BMC, bone mineral contents; BM, body mass.
  3. *p < 0.05 (Paired t test between BIA and DXA).
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