Table 1.

The results of the regression analysis and corresponding P value of second order polynomial model

Model term	MR		HRY		Whiteness		DOM
	Coefficient	P value	Coefficient	P value	Coefficient	P value	Coefficient	P value
B0	79.941	0.000	82.850	0.000	30.2480	0.000	3.1104	0.002
B1	−0.093	0.071	−1.344	0.000	0.16215	0.000	0.0485	0.000
B2	0.685	0.032	−0.769	0.116	−0.09129	0.590	0.0561	0.239
B3	−2.056	0.075	2.077	0.240	−1.95880	0.002	0.1561	0.365
B4	−0.005	0.000	0.013	0.000	0.00131	0.054	−0.0001	0.501
B5	0.011	0.000	−0.003	0.585	−0.00061	0.716	−0.0013	0.005
B6	0.033	0.038	0.008	0.732	−0.00138	0.868	0.0010	0.671
B7	0.0007	0.040	0.011	0.000	−0.00194	0.000	−0.0003	0.000
B8	−0.015	0.078	0.022	0.104	0.00052	0.913	−0.0033	0.013
B9	0.029	0.595	−0.156	0.069	0.09768	0.001	−0.0015	0.854
R2	0.757	–	0.930	–	0.710	–	0.764	–
MSE	0.876	–	2.073	–	0.252	–	0.020	–