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Table 9 Univariate case–control comparisons of demographic risk factors between confirmed positive RHT herds, unconfirmed positive RHT herds, unconfirmed inconclusive RHT herds, and negative RHT herds

From: Risk factors for bovine tuberculosis in low incidence regions related to the movements of cattle

 

Confirmed positive RHT

Unconfirmed positive RHT

Unconfirmed inconclusive RHT

Variable

OR

95% CI  

p-value

OR

95% CI  

p-value

OR

95% CI  

p-value

log10 (Number of cattle tested)

9.03

4.93 – 16.5

<0.001

5.82

3.89 – 8.69

<0.001

4.38

3.75 – 5.13

<0.001

log10 (Number of cattle present)

7.05

3.98 – 12.5

<0.001

4.49

3.07 – 6.56

<0.001

3.22

2.78 – 3.78

<0.001

% of herd imported from high incidence regions

1.05

1.02 – 1.07

<0.001

1.02

0.99 – 1.06

0.220

1.03

1.02 – 1.04

<0.001

log10 (Number of cattle moved onto farm)

2.05

1.48 – 2.85

<0.001

1.99

1.58 – 2.51

<0.001

1.70

1.55 – 1.86

<0.001

log10 (Number of farms within 5 km radius)

0.75

0.39 – 1.45

0.401

1.70

0.96 – 3.02

0.068

0.75

0.62 – 0.91

<0.001

Neighbouring herd with:

         

     confirmed positive RHT

1.40

0.77 – 2.55

0.274

2.00

1.36 – 2.96

<0.001

1.42

1.19 – 1.68

<0.001

     unconfirmed positive RHT

1.97

1.14 – 3.41

0.015

1.78

1.20 – 2.64

0.004

1.47

1.24 – 1.73

<0.001

     unconfirmed inconclusive RHT

2.15

1.16 – 3.98

0.015

2.19

1.42 – 3.40

<0.001

1.86

1.58 – 2.20

<0.001

Northing coordinate (100 km units)

0.58

0.46 – 0.73

<0.001

0.76

0.66 – 0.88

<0.001

0.77

0.73 – 0.81

<0.001

Easting coordinate (100 km units)

0.80

0.58 – 1.09

0.165

1.13

0.89 – 1.43

0.299

1.06

0.97 – 1.17

0.205

Herd production type:

         

     Beef

Ref

-

-

Ref

-

-

Ref

-

-

     Beef fattening

-

-

-

-

-

-

0.51

0.24 – 1.09

0.083

     Beef suckler

1.30

0.72 – 2.35

0.386

1.13

0.75 – 1.70

0.553

0.96

0.82 – 1.13

0.614

     Dairy

2.60

1.33 – 5.09

0.005

1.96

1.21 – 3.18

0.007

1.33

1.08 – 1.64

0.009

     Mixed

-

-

-

-

-

-

5.58

1.43 – 21.7

0.013

log10 (Average number of sheep per year)

1.14

0.94 – 1.39

0.190

1.25

1.08 – 1.44

0.002

1.21

1.14 – 1.28

<0.001

log10 (Average number of poultry per year)

0.48

0.23 – 1.02

0.058

0.53

0.32 – 0.88

0.013

0.71

0.60 – 0.84

<0.001

  1. The analysis included all Scottish cattle herds that were subject to RHT from 2002 to 2009 and used multinomial logistic regression models with herd bTB risk classification as the outcome variable.
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BMC Veterinary Research

ISSN: 1746-6148

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