Table 3: ANOVA for the response surface quadratic polynomial model.

SourceSum of squaresdfMean square value valueSignificance

Model0.0314 20.16<0.00**a
—pH 1 1.110.39
—temperature 1 70.40<0.00**
—E/S 1 48.84<0.00**
—incubation period 1 102.04<0.00**
1 0.430.52
1 2.340.15
1 1.150.30
1 0.810.38
1 1.860.19
1 7.790.01****c
1 2.620.13
1 3.620.08
1 12.320.00***b
1 22.720.00**
Residual 15
Lack of fit 10 0.430.88
Pure error 5
Cor. total0.0329

Std. Dev. -squared0.95
Mean 0.29 Adj. -squared0.90
C.V.% Pred. -squared0.83
PRESS Adeq. precisior18.81

df: degree of freedom.
aSignificance at 0.001 level.
bSignificance at 0.01 level.
cSignificance at 0.05 level