|
Variable
|
Sample size
|
OR
|
SE
|
p
|
95% CI
| |
|---|
|
Herd size
|
|
≥ 250 sows
|
75
|
reference
| | | | |
|
< 250 sows
|
27
|
3.86
|
1.91
|
< 0.05
|
1.46
|
10.19
|
|
Distance to nearest pig herd
|
|
< 2 miles
|
40
|
reference
| | | | |
|
≥ 2 miles
|
62
|
3.42
|
1.71
|
< 0.05
|
1.29
|
9.12
|
- Multivariable logistic regression model of factors associated with herds that were negative for PRRSV antibodies compared to those seropositive or vaccinated (103 herds in total).
- Odds ratio (OR); standard error of the odds ratio (SE); probability function (p); 95% confidence interval (CI) (exp(coefficient+/-(1.96 × standard error)))
