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Table 7 Variables in the final model with a significant effect on a dairy free-stall herd’s digital dermatitis status (n=388b)

From: A case–control study regarding factors associated with digital dermatitis in Norwegian dairy herds

Variable

OR

95% CI of OR

P value

Purchase of livestock during the last 5 years a

 0 animals

Baseline

  

 1–2 animals

1.53

0.61–3.80

0.364

 3–4 animals

1.65

0.53–5.18

0.389

 5–11 animals

1.71

0.77–3.78

0.185

 12–27 animals

2.30

1.03–5.12

0.042

 28–52 animals

4.34

1.71–11.04

0.002

 ≥ 53 animals

5.39

1.90–15.35

0.002

 Missing

   

Trimming frequency a

 1 < 2/year

Baseline

  

  < 1/year

0.41

0.17–0.97

0.043

 2 < 3/year

1.58

0.87–2.85

0.130

  ≥ 3/year

4.09

1.57–10.69

0.004

Certified prof trimmer trims ≥ 90% of cowsa

 No

Baseline

  

 Yes

3.98

1.32–11.95

0.014

Cleaning of feet in chute before trimming

 No

Baseline

  

 Yes

1.98

1.12–3.51

0.019

 Uncertain

0.82

0.31–2.14

0.678

Slatted flooring

 Yes

Baseline

  

 No

2.36

1.30–4.26

0.005

 Uncertain

1.29

0.48–3.48

0.614

 Random effect county (var):

0.568

0.142–2.273

 
  1. Variables with P < 0.05 in the final multilevel logistic regression model
  2. n number of herds, OR odds ratio, CI confidence interval
  3. aData from NDHRS bOne herd had a missing value for slatted flooring