Table 5.

Estimation of regression equations

	Partial Regression Coefficient	Standard Error of the Partial Regression Coefficient	Standard Regression Coefficient	t	P
Constant	0.111	0.495		0.224	0.823
AL difference	-5.778	2.272	-2.381	-2.544	0.013
AL/CR difference	61.555	17.407	3.370	3.536	0.001
ave K difference	19.946	7.322	0.654	2.724	0.008