The conditions and results of 17 experiments in response surface methodology experiments.

Run	Factors			Experimental values
	X 1 ethanol concentration (%)	X 2 extraction times	X 3 liquid–solid ratio (mL g−1)	Total ginsenoside content (mg g−1)
1	80	3	20	36.96 ± 0.34
2	70	4	40	45.25 ± 1.23
3	60	3	40	37.19 ± 0.56
4	80	4	30	39.43 ± 1.89
5	80	2	30	34.23 ± 0.67
6	80	3	40	40.92 ± 1.87
7	60	3	20	34.49 ± 0.65
8	70	3	30	45.22 ± 0.87
9	60	4	30	38.98 ± 0.45
10	70	3	30	44.33 ± 1.86
11	70	3	30	46.20 ± 2.01
12	70	3	30	46.77 ± 1.45
13	70	2	40	40.15 ± 1.09
14	60	2	30	31.81 ± 0.54
15	70	4	20	40.45 ± 1.65
16	70	2	20	36.00 ± 1.21
17	70	3	30	45.55 ± 1.69