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Table 4 Multivariate risk factor analysis for antibiotics (AB) treated pigs in herd A

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

 BW2 at 2 weeks3

>  4.5 kg

Ref2

  

2.7–4.5 kg

1.72

< 0.001

0.66–5.20

<  2.7 kg

7.08

< 0.001

2.55–23.00

Risk factors for AB treatment at four weeks of age

 BW at 4 weeks

>  7.2 kg

Ref

  

4.5–7.2 kg

2.33

0.395

0.61–8.92

<  4.5 kg

8.09

0.044

1.39–46.07

Risk factors for AB treatment at 12 weeks of age

 BW at 4 weeks

>  7.2 kg

Ref

  

4.5–7.2 kg

2.84

0.083

1.18–8.49

<  4.5 kg

23.54

< 0.001

8.89–75.30

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