Table 3 Statistical analysis results of the optimal models in hardness (Y₁), cohesiveness (Y₂) and springiness (Y₃)

Term	Hardness (Y1)		Cohesiveness (Y2)		Springiness (Y3)
	Coefficient	p	Coefficient	p	Coefficient	p
Intercept	158.5	0.000	1.420	0.000	9.470	0.000
X1	-1.930	0.001	-0.104	0.000	-0.305	0.010
X2	2.380	0.048	-0.614	0.000	1.804	0.108
X3	-4.592	0.000	0.283	0.000	-0.312	0.000
X22	-	-	-	-	-0.423	0.002
X32	0.034	0.001	-0.004	0.000	0.001	0.018
X1X3	0.065	0.009	-	-	0.008	0.000
R2 (%)	92.27		93.32		94.41
Lack of fit	0.235		0.194		0.281