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Table 4 Random effect multivariable logit model assessing the variation in the presence of bTB visible lesions. Test result modelled as categories of the bovine-avian Purified Protein Derivative (PPD) tuberculin reaction size (n = 5698)

From: Bovine tuberculosis visible lesions in cattle culled during herd breakdowns: the effects of individual characteristics, trade movement and co-infection

Predictor

Categories

OR

Std. Err.

z

P

Lower 95% CI

Upper 95% CI

b-a PPD reaction size

       
 

<0 mm

2.29

0.83

2.28

0.023

1.12

4.65

 

0 mm

Ref.

     
 

1-4 mm

6.31

1.64

7.07

<0.001

3.79

10.51

 

5-9 mm

14.57

3.66

10.66

<0.001

8.90

23.85

 

10-19 mm

42.59

10.79

14.81

<0.001

25.92

69.98

 

>20 mm

103.03

27.29

17.50

<0.001

61.31

173.15

Log(No. associated herds)

 

2.27

0.19

9.76

<0.001

1.92

2.67

Breed

Non-dairy

Ref.

     
 

Dairy

0.79

0.08

−2.43

0.015

0.65

0.96

Penultimate test results

Negative

Ref.

     
 

Severe interpretation positive

3.98

0.93

5.93

<0.001

2.52

6.28

 

No previous test result

1.08

0.17

0.48

0.629

0.79

1.48

Constant

 

0.02

0.01

−14.95

<0.001

0.01

0.03

RE

ρa

0.28

0.03

  

0.23

0.33

  1. aIntra-class correlation