extremely significantp < 0.01
The C item was extremely significant ( p < 0.01), and the quadratic item (A 2 , B 2 , C 2 , D 2 ) showed a significant level ( p < 0.01).
The C item was extremely significant ( p < 0.01), and the quadratic item (A 2 , B 2 , C 2 , D 2 ) showed a significant level ( p < 0.01).