Table 2.

The coded variables and experimental yield values in the study.

Run	x 1 (°C)	x 2 (g/200 mL)	x 3 (h)	Yield (%)
1	−1	1	0	59.75
2	−1	0	1	51.45
3	0	0	0	64.94
4	0	1	1	66.98
5	1	0	1	80.45
6	0	−1	1	89.29
7	0	1	−1	48.62
8	−1	−1	0	64.20
9	1	1	0	64.15
10	0	0	0	64.31
11	1	−1	0	75.12
12	−1	0	−1	50.65
13	1	0	−1	68.10
14	0	−1	−1	80.07
15	0	0	0	64.69