Table 7.

Experimental results of Box–Behnken Design.

Test	X1 Time (h)	X3 Inoculum Level (%)	X5 pH	Response Value (OD600)
1	−1	0	1	2.54
2	0	−1	1	2.94
3	0	0	0	2.27
4	1	1	0	2.73
5	−1	1	0	2.4
6	1	−1	0	1.96
7	0	0	0	2.57
8	1	0	1	2.51
9	0	−1	−1	1.8
10	0	1	1	2.80
11	1	0	−1	1.36
12	0	0	0	2.82
13	−1	0	−1	1.30
14	−1	−1	0	2.27
15	0	0	0	2.82
16	0	1	−1	1.97
17	0	0	0	2.60