Table 2.

The design and results of Plackett–Burman experiment.

Run numbers	X1	X2	X3	X4	X5	X6	Y1	Y2
							(1010 CFU/mL)	(mm/mL)
1	1	1	1	−1	1	1	2.24	140.24
2	1	−1	−1	−1	1	1	0.63	135.78
3	−1	1	1	−1	1	−1	0.57	141.89
4	1	1	−1	1	−1	−1	0.84	138.13
5	1	1	−1	1	1	−1	0.74	138.60
6	−1	−1	−1	−1	−1	−1	0.36	139.80
7	−1	−1	1	1	1	−1	1.23	137.74
8	−1	1	−1	−1	-1	-1	0.56	137.05
9	-1	1	1	1	-1	1	1.77	141.06
10	1	-1	1	1	-1	1	2.06	143.43
11	-1	-1	-1	1	1	1	0.76	139.39
12	1	-1	1	-1	-1	-1	0.72	141.72