Table 5 Parameter estimates and associated standard errors (s.e.) and tests of significance for the models given by Eqs. 4 and 5

Eq. (4)

γ ₀

5.831

0.278

20.955

<0.001

γ ₁

−0.367

0.006

−57.453

<0.001

γ ₂

1.556

0.218

7.126

<0.001

γ ₃

0.341

0.027

12.779

<0.001

Eq. (5)

γ ₀

7.319

0.282

25.920

<0.001

γ ₁

−0.199

0.013

−15.505

<0.001

γ ₂

0.835

0.070

11.914

<0.001

γ ₃

0.073

0.008

9.483

<0.001