Protective Effect of Costus afer Aqueous Leaf Extract (CALE) on Low-Dose Heavy Metal Mixture-Induced Alterations in Serum Lipid Profile and Hematological Parameters of Male Wistar Albino Rats

Table 5

Summary of regression models for total cholesterol (TC) in serum.

Model type	Equation	R^2	MSE	RMSE
Exponential	y = 3.666e^−2E−0x	0.995	0.003	0.055
Linear	y = −0.000x + 13.628	0.978	0.015	0.122
Polynomial (2^nd order)	y = 2E − 07x^2 − 0.001x + 3.713	0.999	0.001	0.031

The best model with respect to R², MSE, and RMSE values, where y = concentration of the total cholesterol and x = Costus afer dose.