Table 1.

Regression coefficient, standard error, and analysis of variance (ANOVA) analysis of flavonoid extraction.

Factor	Trifolirhizin	Formononetin	Isoxanthohumol	Maackiain	Kurarinone
F Value (Model)	2.68 *	3 *	2.9 *	2.76 *	2.63 *
Intercept	2156.02	191.81	490.11	675.45	2632.55
X1 (Time)	7.09	−1.37	1.97	−14.06	38.28
X2 (Methanol concentration)	203.12 **	3.89	4.90	37.05 *	116.87 *
X3 (Temperature)	−30.26	−7.30	2.44	−35.14 *	68.12
X4 (Solvent-to-sample ratio)	107.87 *	16.56 *	28.77 **	44.03 **	113.83 *
X1X2	−238.19 *	−12.30	−15.68	−45.85	72.16
X1X3	38.95	−1.05	−12.42	−31.24	−61.74
X1X4	61.92	18.71	1.01	24.88	−243.38
X2X3	32.12	13.57	19.25	13.43	70.00
X2X4	14.60	−16.75	−17.01	−60.72 *	−33.67
X3X4	−103.30	−8.68	34.37 *	37.21	70.70
X12	75.39	9.63	2.36	−5.72	194.62
X22	−86.69	−4.26	−16.77	−9.61	−83.15
X32	90.78	16.32	31.07 *	−7.62	51.19
X42	26.23	−23.93 *	−6.43	−24.05	61.22
R2	0.728	0.7501	0.7434	0.7339	0.7244
Adj. R2	0.456	0.5001	0.4679	0.4868	0.4488
F Value (Lack of Fit)	1.44	1.69	3.71	1.28	2.11

Note: * p < 0.05 significant, ** p < 0.01 highly significant.