Table 4.

Analysis of variance (ANOVA) for the full quadratic model for optimization of mycelial TA production in G. lingzhi.

Regression	DF	Type I Sum of Squares	R-Square	F value	Pr > F
Linear	3	15590	0.7526	195.2000	<0.0001 **
Quadratic	3	4674.5419	0.2257	58.5300	<0.0001 **
Cross product	3	263.3698	0.0127	3.3000	0.0877
Total model	9	20527	0.9910	85.6800	<0.0001 **

** Significant at the 0.01 level.