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Table 5 Multivariate risk factor analysis for antibiotics (AB) treated pigs in herd B

From: Performance and risk factors associated with first antibiotic treatment in two herds, raising pigs without antibiotics

Factor

Level

Odds ratio

P-value1

CI2

Risk factors for AB treatment at two weeks of age

 Gender3

Female

Ref2

  

Barrow

4.81

0.019

1.46–21.89

 Litter size of mother sow

>  25

Ref3

  

19–25

0.89

0.983

0.25–5.14

< 19

8.35

0.022

1.79–45.83

Risk factors for AB treatment at four weeks of age

 Gender

Female

Ref

  

Barrow

4.05

0.019

1.37–14.98

 Litter size of mother sow

>  25

Ref3

  

19–25

0.97

0.999

0.30–3.72

<  19

6.65

0.029

1.54–30.96

Risk factors for AB treatment at 12 weeks of age

 Litter size of mother sow

>  25

Ref

  

19–25

0.50

0.301

0.20–1.29

<  19

2.29

0.029

0.63–7.72

  1. 1 Association tested by Chi square-test
  2. 2 CI = Confidence intervals; Ref = Reference when calculating odds ratio
  3. 3 For the number of pigs in each category, see Table 1