Table 3.

Regression analysis of the 2³ full factorial design with maximum biomass (log₁₀ cfu/mL) as the response.

Variable	F Value	P value
x 1 a	87.94	0.0007
x 2	6.40	0.0647
x 3	1.67	0.2658
x 1 x 2	2.06	0.2246
x 1 x 3	0.11	0.7572
x 2 x 3	0.40	0.5623
x 1 x 2 x 3	0.07	0.8034
Model	14.09	0.0112
Curvature	3.94	0.1182
C.V = 2.78%	R 2 = 0.96	Adjusted R 2 = 0.90

  ^a x ₁ represents skim milk concentration in % (wt/vol).

x ₂ represents yeast extract concentration % (wt/vol).

x ₃ represents glucose concentration % (wt/vol).