Table 4.

The fitted quadratic model in terms of coded variables for Y1, Y2, and Y3 responses

Response	2nd order polynomial equation	p value	F value	R2	R2 adjusted
Ethanol	Y1 =  + 6.02 − 0.11A + 0.014B − 0.21C − 0.40D − 0.31E − 0.12AB + 0.10AC + 0.073AD + 0.073AE − 0.020BC − 0.052 + 0.14BE + 0.17CD + 0.16CE + 0.37DE + 0.074A2 + 0.17B2 + 0.20C2 + 0.28D2 + 0.26E2	0.0001	77.8	0.9383	0.9685
Total phenol content	Y2 =  + 512.58 + 1.15A − 5.68B − 13.08C − 31.63D − 36.67E − 1.55AB − 1.00AC + 3.27AD + 1.10AE + 0.76BC + 3.74BD + 0.97BE + 8.03CD + 5.39CE + 6.93DE + 28.42A2 + 32.27B2 + 21.63C2 + 25.97D2 + 3.81E2	0.0001	485.18	0.9906	0.9949
Total antioxidant capacity	Y3 =  + 85.63 + 0.75A − 1.39B − 3.62C − 0.672D − 9.80E + 2.45AB − 0.95AC + 6.02AD + 1.00AE − 2.45BC + 4.23BD + 1.07BE + 2.57CD + 8.53CE + 9.01DE + 2.87A2 + 1.41B2 − 0.87C2 + 2.24D2 + 3.11E2	0.0001	112.61	0.9626	0.9781