Table 3: Test of significance for regression coefficient of Box–Behnken design.

SourceSum of squaresDfMean square value value

Yield
44.96144.9654.000.0007
10.57110.5712.700.0162
25.97125.9731.200.0025
17.83117.8321.420.0057
0.8010.800.970.3707
19.40119.4023.300.0048
3.9713.974.770.0806
0.1910.190.230.6532
0.4010.490.590.4782

Total polyphenol content
20328.34120328.3437.530.0017
361.541361.540.670.4511
5.1415.140.9262
1076.8211076.821.990.2176
3.6913.690.9375
65190.86165190.86120.360.0001
87603.73187603.73161.740.0001
6457.52112858.3711.920.0046
12858.37112858.3723.740.0046

Total antioxidant activity
13.55113.5517.770.0084
1.8211.822.390.1826
12.48112.4816.360.0099
0.7910.791.040.3548
2.5812.583.380.1254
3.9213.925.140.0727
98.45198.45129.630.0001
50.04150.0465.630.0005
32.21132.2142.250.0013

Note. Values are significantly different at .