Table 2.

Analysis of variance (ANOVA) for surface quadratic model

Source	Ethanol		Methanol		Acetone
	Yield (%)	TPC (mg GAE/g)	Yield (%)	TPC (mg GAE/g)	Yield (%)	TPC (mg GAE/g)
Model	0.0271	< 0.0001	< 0.0001	< 0.0001	< 0.0001	< 0.0001
A-Ethanol	0.0178	< 0.0001	0.1253	< 0.0001	0.0001	< 0.0001
B-Time	0.0259	0.0041	0.0001	< 0.0001	< 0.0001	0.0099
AB	1.0000	0.3716	0.0006	0.0004	–	0.0269
A2	0.0536	< 0.0001	0.1318	0.0245	–	< 0.0001
B2	0.0896	< 0.0001	< 0.0001	< 0.0001	–	< 0.0001
Lack of fit	0.7346	0.9701	0.6108	0.9113	0.6053	0.7409
R2	0.7854	0.9973	0.9829	0.9954	0.9222	0.9999
Adjusted R2	0.6321	0.9954	0.9706	0.9922	0.9067	0.9998
Predicted R2	0.3671	0.9950	0.9413	0.9900	0.8644	0.9997
Adeq. precision	6.1371	51.3993	27.8275	59.8149	22.2826	242.6480