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Table 3 Odds ratios with 95% confidence intervals of the full and final mixed effect logistic regression models for ELISA and PCR results as outcomes.

From: Repeated cross-sectional sampling of pigs at slaughter indicates varying age of hepatitis E virus infection within and between pig farms

ELISA results

 

Full model

Best fitting model

Fixed effect

Odds ratio

95% CI

Odds ratio

95% CI

Farm type

 Organic

Ref.

Ref.

Dropped during backward selection by AIC

 Conventional

0.60

0.33–1.08

 High health

0.52

0.22–1.21

 HyCare

0.35

0.14–0.88*

ELISA test

 Original

Ref.

Ref.

Dropped during backward selection by AIC

 Alternative

1.02

0.79–1.32

PCR results

 

Full model

Best fitting model

Fixed effect

Odds ratio

95% CI

Odds ratio

95% CI

Farm type

 Organic

Ref.

Ref.

Ref.

Ref.

 Conventional

9.61

5.19–17.8*

9.69

5.24–17.9*

 High health

7.54

3.58–15.9*

7.67

3.66–16.1*

 HyCare

9.25

4.38–19.6*

9.39

4.45–19.8*

Batch seropositive proportion

0.88

0.62–1.24

Dropped during backward selection by AIC

  1. *the odds ratio is significantly different from the reference category.