Table 4 Regression coefficients and statistical parameters measuring the correlation and significance of models and model terms

a. Regression coefficients and significance of model terms

b₀

49.51*

88.87*

1.60*

10.07*

0.35

20.87*

b₁

− 8.98*

5.03**

− 1.16*

− 2.22*

− 1.93*

− 3.22*

b₂

− 2.55

6.21*

− 0.20

− 3.40*

0.63

2.71**

b₃

− 6.45*

5.25**

− 1.21*

− 1.75*

− 1.03

− 7.58*

b₁₂

2.20

− 2.52

0.09

1.10

− 0.76

− 1.98

b₁₃

4.78

− 5.64**

0.95**

1.85

2.26**

− 2.64**

b₂₃

0.85

0.20

0.11

− 0.76

− 0.07

− 3.43**

b₁₁

− 2.22

− 2.74

− 0.34

1.13

1.63**

− 0.55

b₂₂

0.30

− 4.08

0.72

2.39**

− 0.15

− 0.84

b₃₃

− 0.09

− 4.27

0.69

1.22

0.36

− 4.26*

b. Statistical parameters measuring correlation and significance of models

R²

0.927

0.923

0.937

0.938

0.911

0.975

Fischer´s F parameter

7.0

6.5

8.0

8.5

5.5

22.0

Significance of models (based on the F parameter)

 > 97

 > 97

 > 98

 > 98

 > 96

 > 99