Table 3 Regression coefficients and analysis of variance (ANOVA) results for the MAE models for dependent responses

Coefficients	TFC1)	TAC	TPC	DPPH
Intercept	65.71**3)	0.449***	14.663**	92.467***
ETOH2)	0.19	0.011**	0.078**	0.188**
TIME	0.13	0.009**	0.144**	0.133**
POWER	0.1	0.013**	0.105**	0.038
ETOH*ETOH	-0.95***	-0.030***	-0.139***	-0.191***
ETOH*TIME	0.23	-0.003	-0.010**	0.084
ETOH*POWER	-0.07	-0.003	0.068	-0.026
TIME*TIME	-0.62***	-0.030***	-0.179***	-0.290***
TIME*POWER	0.25	0.223	-0.095**	-0.026
POWER*POWER	-0.45**	-0.024***	-0.153***	-0.286***
R square	0.95	0.97	0.94	0.95
Lack of fit	0.36	0.28	0.34	0.41
Model significance	<.0001	<.0001	<.0001	<.0001
Stationary points	maximal	maximal	maximal	maximal

TFC, total flavonoid content; TAC, total anthocyanin content; TPC, total polyphenol content; DPPH, DPPH radical scavenging activity.
ETOH, ethanol concentration; TIME, irradiation time; POWER, microwave power.
^*** p<0.001, ^** 0.001<p<0.05, ^* 0.05<p<0.1.