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Table 3 Prediction equation for fat-free mass (n = 78).

From: Body fat measurement by bioelectrical impedance and air displacement plethysmography: a cross-validation study to design bioelectrical impedance equations in Mexican adults

  Developed equation Cross-Validated equation
  Intercept Age H2/R BW(kg) Xc (Ω) R2 MSE (kg) SQRRMSE (kg) Pure Error
  - 2.4658 - 0.1773 0.7374 0.1763 0.1198 0.969 3.97 1.99 2.96
R2 increase when this IV is added - 0.0038 0.9323 0.0281 0.0047 - - - -
Total R2 for this IV and the rest - 0.0038 0.9361 0.9642 0.9689 - - - -
R2 when this IV is fit alone - 0.0038 0.9149 0.7273 0.0256 - - - -
Partial R2 adjusted for other IVs - 0.2920 0.8767 0.420 0.1303 - - - -
  1. Ht2/R = Height2 (cm)/resistance (Ω); BW = Body weight (kg); Xc = reactance (Ω); MSE = Mean square error, SQRMSE = Square root of MSE; IV = independent variable.