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Table 3 Prediction equations for fat-free mass based on different resistance indices (RI)

From: Bioelectrical impedance analysis to estimate body composition, and change in adiposity, in overweight and obese adolescents: comparison with dual-energy x-ray absorptiometry

Group

 

Regression coefficients

n

RI

Sex

Weight

Constant

r 2

SEEa

P

Resistance index

nil

 

All subjects

66

-

-5.114

0.454

14.867

0.773

5.56

0.001

Resistance index

H 2 /R 50

 

A

33

0.615

-2.906

0.213

4.294

0.918

3.79

0.001

B

33

0.578

-2.589

0.204

6.777

0.881

3.93

0.001

All subjects

66

0.589

-2.849

0.213

5.657

0.901

3.76

0.001

Resistance index

H 2 /R ∞

 

A

33

0.393

-3.062

0.259

4.645

0.907

4.03

0.001

B

33

0.481

-2.453

0.173

6.392

0.902

3.57

0.001

All subjects

66

0.444

-3.001

0.212

5.846

0.902

3.73

0.001

Resistance index

H 2 /Zc

 

A

33

0.718

-2.202

0.195

0.156

0.926

3.60

0.001

B

33

0.561

-3.240

0.219

7.104

0.863

4.23

0.001

All subjects

66

0.612

-2.936

0.217

4.354

0.896

3.85

0.001

  1. RI examined were height2/resistance 50 kHz (H2/R50), height2/estimated resistance at infinity (H2/R∞) and height2/impedance at characteristic frequency (H2/Zc).
  2. aSEE standard error of estimate.
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BMC Pediatrics

ISSN: 1471-2431

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