extremely significantp < 0.001
The linear terms A and B, the interaction term CD and the quadratic terms A 2 , B 2 , C 2 , and D 2 in the model showed extremely significant effects ( p < 0.001).
The linear terms A and B, the interaction term CD and the quadratic terms A 2 , B 2 , C 2 , and D 2 in the model showed extremely significant effects ( p < 0.001).
The linear term D, the interaction terms AB showed highly significant effects ( p < 0.01).