Table 5 Variance analysis of sterilization rate of response surface

Variation source	Sum of squares	Freedom	Mean square deviation	F-value	p-value	Significance
Model	291.9	9	32.43	17.73	0.0005	**
A	79.13	1	79.13	43.27	0.0003	**
B	8.78	1	8.78	4.8	0.0646
C	1.38	1	1.38	0.75	0.4142
AB	1.66	1	1.66	0.91	0.3719
AC	0.59	1	0.59	0.32	0.5869
BC	36.48	1	36.48	19.95	0.0029	**
A2	64.49	1	64.49	35.26	0.0006	**
B2	75.82	1	75.82	41.46	0.0004	**
C2	9.2	1	9.2	5.03	0.0598
Residual	12.8	7	1.83
Missing item	12.77	3	4.26	619.81	0.091
Pure error	0.027	4	6.87E-03
All items	304.7	16
r2	0.9580
Adj r2	0.9040

^* p<0.05
^** p<0.01.