Table 2.

RSM experimental design and weighting of the xylose content and extraction yield.

Number	Decocting time	Ratio of water to raw material	Ethanol concentration (%)	Total sugar (%)	Extraction yield (%)	Weighting (%)
1	4	80	95	83.00	70.40	75.44
2	4	120	95	86.25	73.40	78.54
3	4	100	90	82.16	71.60	75.82
4	4	100	100	83.94	77.60	80.14
5	5	120	100	94.38	86.00	89.35
6	5	120	90	93.01	84.60	87.96
7	5	80	100	92.87	82.40	86.59
8	5	80	90	89.21	81.80	84.76
9	6	100	100	91.81	84.40	87.36
10	6	120	95	88.45	85.00	86.38
11	6	100	90	90.62	81.20	84.97
12	6	80	95	89.11	80.60	84.00
13	5	100	95	96.59	87.20	90.96
14	5	100	95	96.30	86.80	90.60
15	5	100	95	96.63	86.40	90.49
16	5	100	95	96.44	86.60	90.54
17	5	100	95	96.68	87.00	90.87