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Table 4 Risk factors for PRRSV infection identified in multivariable logistic regression analysis, model adjusted for herd size and production type (outdoor/indoor), N=117, R 2 =0.35

From: Risk factors for porcine reproductive and respiratory syndrome virus infection and resulting challenges for effective disease surveillance

Variable name Value N(%) OR 95% CI p-value*
PRRS vaccine none 74 (63.3) 1.0   
  killed 6 (5.1) 0.5 0.1-5.6 0.55
  live 37 (31.6) 7.5 2.5-22.8 <0.01
Dead pigs disposal incineration 38 (32.5) 1.0   
  collection 79 (67.5) 5.6 1.7-18.3 <0.01
Pig density (in 10 km radius) <15000 80 (68.4) 1.0   
  ≥15000 37 (31.6) 2.9 1.0-8.3 0.04
Age at weaning in days 21-27 57 (48.7) 1.0   
  ≥28 60 (51.3) 0.2 0.1-0.7 <0.01
  1. *Wald test p-value, OR: odds ratio, CI: confidence interval.