Table 4.
Risk factors associated with a positive infection status (comparison of infected herds vs. control herds)
| Variables | % cases/% controls | OR 1 | 95% CI 2 | p-value |
|---|---|---|---|---|
| All herds |
|
|
|
|
| Animal purchase3 |
53/16 |
7.25 |
1.86-28.34 |
0.004 |
| Dairy herds |
|
|
|
|
| Animal purchase3 |
60/23 |
6.34 |
1.18-34.13 |
0.031 |
| Beef herds |
|
|
|
|
| No significant factors |
1OR = odds ratio.
295% CI = 95% confidence interval.
3Farms that purchased two or more animals per year on average compared to farms that purchased up to one animal per year on average.