Table 2 Mean levels and agreement of body composition measures assessed by DSMF-BIA and DXA among older adults with T2DM.

From: Validation of a multi-frequency bioelectrical impedance analysis device for the assessment of body composition in older adults with type 2 diabetes

Variablea

Means comparisona

Bland–Altman

Intraclass correlation coefficientb

DXA

DSMF-BIA

p-valuec

Biasd

Limit of agreemente

Functionf

p-valuec

ICC

p-valuec

Lean mass components

Arms lean body mass (kg)

5.29 ± 1.37

5.61 ± 1.60

p < 0.0001

0.31

−1.04 to 1.67

Y = 0.16X – 0.58

0.001

0.933

p < 0.0001

Legs lean body mass (kg)

15.19 ± 3.52

14.76 ± 3.62

p < 0.0001

−0.43

−2.36 to 1.49

Y = 0.03X – 0.86

0.353

0.957

p < 0.0001

Trunk lean body mass (kg)

24.21 ± 5.01

22.91 ± 4.86

p < 0.0001

−1.29

−4.80 to 2.21

Y = −0.3X – 0.53

0.425

0.950

p < 0.0001

ASMI (kg/m2)g

7.47 ± 1.29

7.43 ± 1.28

0.84

−0.068

−1 to 0.86

Y = −0.022X – 0.231

0.595

0.965

p < 0.0001

Fat mass components

% Fat

36.98 ± 6.46

38.44 ± 6.71

p < 0.0001

1.46

−3.24 to 6.15

Y = 0.04X + 0.04

0.356

0.954

p < 0.0001

Arms fat mass (kg)

3.21 ± 1.58

5.55 ± 2.72

p < 0.0001

2.32

−1.15 to 5.79

Y = 0.59X – 0.23

<0.0001

0.615

p < 0.0001

Legs fat mass (kg)

8.92 ± 3.47

8.54 ± 2.55

0.043

−0.38

−3.79 to 3.04

Y = –0.33X + 2.45

<0.0001

0.907

p < 0.0001

Trunk fat mass (kg)

17.48 ± 5.57

16.30 ± 4.88

p < 0.0001

−1.17

−4.83 to 2.49

Y = –0.13X + 1.09d

0.001

0.955

p < 0.0001

  1. ASMI appendicula skeletal mass index, DXA dual-energy X-ray absorptiometry, DSMF-BIA direct segmental multi-frequency bioelectrical impedance analysis device, ICC intraclass correlation coefficient, T2DM type 2 diabetes.
  2. aVariables are presented as mean ± standard deviation and differences between DSMF-BIA method and DXA in each body composition parameter were examined by paired sample t-test.
  3. bICC > 0.9 = excellent; ICC 0.9–0.75 = good; ICC 0.75–0.5 = moderate; ICC < 0.5 = poor.
  4. cFor means comparison and Bland–Altman tests a p < 0.05 represents a significant difference or a significant bias, whereas for intraclass correlation coefficient a p < 0.05 represents a significant correlation.
  5. dMean bias is considered the mean difference for each measurement between DSMF-BIA and DXA.
  6. eLimit of agreement = mean bias ± 1.96 SD.
  7. fA regression analysis using ordinary least squares regression.
  8. gAppendicular lean mass index was calculated as the sum of the lean mass in the arms and legs divided by height squared (kg/m2).
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