Table 2.

Results of the fractional factorial design matrix of rice straw degradation.

Running number	X1	X2	X3	X4	Reducing sugar yield (%)
1	0	0	1	−1	1.71
2	1	−1	0	0	1.28
3	0	0	0	0	1.43
4	−1	−1	0	0	1.23
5	0	0	0	0	1.7
6	0	0	−1	1	1.78
7	0	1	0	−1	1.66
8	1	0	−1	0	1.53
9	0	−1	−1	0	1.62
10	0	−1	1	0	1.33
11	−1	0	−1	0	0.83
12	−1	0	1	0	1.08
13	0	0	0	0	1.74
14	0	0	0	0	1.69
15	0	1	0	1	1.79
16	1	0	0	1	1.81
17	0	0	0	0	1.71
18	0	−1	0	−1	1.09
19	−1	1	0	0	1.13
20	−1	0	0	−1	0.89
21	0	1	1	0	1.75
22	1	1	0	0	1.96
23	0	−1	0	1	1.36
24	1	0	1	0	1.66
25	0	1	−1	0	1.78
26	0	0	1	1	1.76
27	1	0	0	−1	1.47
28	0	0	−1	−1	1.58
29	−1	0	0	1	0.94