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

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

	*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	-	-	-	-

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.

ISSN: 1475-2891