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Table 3 Model 1.

From: Porcine reproductive and respiratory syndrome virus (PRRSV) in GB pig herds: farm characteristics associated with heterogeneity in seroprevalence

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
  1. 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).
  2. Odds ratio (OR); standard error of the odds ratio (SE); probability function (p); 95% confidence interval (CI) (exp(coefficient+/-(1.96 × standard error)))