Regression Coefficient Total peak area (TIC) Main effects P value Quadratic effects P value Interaction effects P value   (x 104) X1 X2 X3 X1 X2 X3 X1 X2 X3 b0 44373.22 <0.0001* (224.52)                 b1 6911.56   0.3215≠ (1.10)               b2 483.93     0.1427≠ (2.58)             b3 740.88       0.0012* (21.41)           b12 -2078.31         0.0730≠ (4.12)         b22 -911.59           0.3779≠ (0.86)       b32 -416.61             0.7027≠ (0.16)     b12 237.50               0.2521≠ (1.50)   b13 -737.50                 0.9839≠ (0.00043) b23 -12.50                   R2 0.9658                   R2(adj) 0.9315                   Regression P <0.0001*                   Lack of fit value 0.000*                   bi The estimated regression coefficient for the main linear effects (b1, b2 & b3) bii The estimated regression coefficient for the quadratic effects (b12, b22, b32) bij The estimated regression coefficient for the interaction effects (b12, b13, b23) *Significant (P < 0.05) ≠Not significant (P > 0.05) ( ) F ratio values X1Extraction temperature, X2Equilibrium time, X3Extraction time

Table 3: ANOVA, regression coefficients of the first- and second-order polynomial regression model, R2, adjusted R2, probability values and lack of fit for flavour total peak area (TIC) in coded form of process variables.