Table 3.

ANOVA analysis of model response for extraction yield, total phenolic content and total flavone content (TFC).

Source	DF	Extraction yield (%)		TPC (mg GAE/L)		TFC (mg QE/L)
		F-Value	p-Value	F-Value	p-Value	F-Value	p-Value
Model	14.0	534.7	<0.0001	11.63	<0.0001	13.73	<0.0001
X1	1.00	15.4	0.0015	17.52	0.0009	11.40	0.0045
X2	1.00	7439	<0.0001	128.2	<0.0001	157.3	<0.0001
X3	1.00	14.3	0.0020	0.75	0.3998	1.78	0.2035
X4	1.00	0.08	0.7794	0.23	0.6390	4.34	0.0559
X12	1.00	0.44	0.5187	2.74	0.1198	3.36	0.0881
X13	1.00	2.78	0.1175	3.04	0.1030	2.42	0.1420
X14	1.00	5.53	0.0339	9.43	0.0083	0.27	0.6091
X23	1.00	1.64	0.2207	1.50	0.2413	0.58	0.4577
X24	1.00	0.57	0.4622	3.21	0.0946	1.62	0.2241
X34	1.00	1.60	0.2265	0.01	0.9273	0.40	0.5390
$X_1^2$	1.00	0.18	0.6781	0.56	0.4661	2.21	0.1590
$X_2^2$	1.00	0.06	0.8074	0.48	0.4981	3.40	0.0864
$X_3^2$	1.00	0.01	0.9110	0.02	0.8946	0.10	0.7547
$X_4^2$	1.00	3.09	0.1005	0.11	0.7398	1.72	0.2112
R2		0.99		0.93		0.93
Adj-R2		0.98		0.84		0.86
CV%		1.99		13.1		12.50
Adeq.Pre		72.6		13.62		12.84

GAE, gallic acid equivalent; QE, quercetin equivalent. R², regression coefficient; Adj-R², regression coefficient adjusted, CV, coefficient of variance, Adeq.Pre –adequate precision.