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Table 3 Logistic estimates for IAV-S positivity according to selected variables

From: Effect of herd size on subclinical infection of swine in Vietnam with influenza A viruses

Variable   P Odds ratio 95 % CI
Total number of pigs <1000   reference
1000 <0.001 25.54 7.42 to 87.98
Type of operation Not farrow-to-finish   reference
Including farrow-to-finish 0.85 0.89 0.24 to 3.24
Type of pig house Open-sided or semi-open-sided house   reference
Windowless 0.26 0.36 0.06 to 2.10
Other animals on farm No   reference
Yes 0.55 0.70 0.21 to 2.29
Constant   <0.001 0.13