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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.