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Table 7 Estimated risk ratios, significance tests for the combined RS/lameness variables, and fit of the Prentice and Gloeckler's regression model.

From: Culling Rate of Icelandic Horses due to Bone Spavin

Explanatory variable

Dependent variables

RS/Lameness status:

RR culling

RR CHLL

0

1.000

1.000

1

1.294

1.916

2

1.871

2.709

3

2.572

10.156

Significance of the explanatory variable

χ2 = 15.12**

df = 3

R2 = 0.34

χ2 = 39.19***

df = 3

R2 = 0.17

Fit of the model

R2 = 0.36

R2 = 0.23

  1. p < 0.05, ** p < 0.01. *** p < 0.001
  2. RR: risk ratio
  3. RS: radiographic signs of bone spavin
  4. CHLL: culling because of hind limb lameness