Table 10.
Multivariate case–control comparison of demographic risk factors between confirmed positive RHT herds, unconfirmed positive RHT herds, unconfirmed inconclusive RHT herds, and negative RHT herds
| |
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) |
8.56 |
4.59 – 16.0 |
<0.001 |
5.78 |
3.77 – 8.87 |
<0.001 |
4.72 |
3.98 – 5.58 |
<0.001 |
| % of herd imported from high incidence regions |
1.05 |
1.02 – 1.08 |
<0.001 |
|
|
|
1.03 |
1.01 – 1.04 |
<0.001 |
| log10 (Number of farms within 5 km radius) |
0.24 |
0.11 – 0.56 |
<0.001 |
|
|
|
0.38 |
0.30 – 0.48 |
<0.001 |
| Neighbouring herd with: |
|
|
|
|
|
|
|
|
|
| unconfirmed positive RHT |
1.79 |
0.99 – 3.20 |
0.050 |
|
|
|
1.37 |
1.15 – 1.64 |
<0.001 |
| unconfirmed inconclusive RHT |
2.12 |
1.03 – 4.31 |
0.040 |
1.65 |
1.03 – 2.63 |
0.037 |
1.90 |
1.57 – 2.31 |
<0.001 |
| Herd production type: |
|
|
|
|
|
|
|
|
|
| Beef |
|
|
|
|
|
|
Ref |
- |
- |
| Dairy | 0.70 | 0.55 – 0.88 | 0.003 | ||||||
The analysis included all Scottish cattle herds that were subject to RHT from 2002 to 2009 and used a multinomial logistic regression model with herd bTB risk classification as the dependent variable.