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Table 3 Odds ratios (ORs) with 95% confidence intervals (CIs) for the explanatory variables significantly associated with veterinary treatment (yes = 1/no = 0), given a disease event (two-level logistic model) for cows estimated using log likelihood estimation.

From: Herd and cow characteristics affecting the odds of veterinary treatment for disease – a multilevel analysis

Variables

Categories

OR

95% CI

Fixed part:

    

Breed a

Swedish Holstein

BLb

  
 

Swedish Red

0.4

0.2

0.8

 

Mixed/other

0.4

0.2

1.2

Days in milk

< 7

BL

  
 

7–70

0.6

0.4

0.9

 

70–168

0.4

0.3

0.6

 

> 168

0.3

0.2

0.5

Study month

January

BL

  
 

April

1.4

0.9

2.0

 

July

3.7

2.5

5.5

 

October

3.3

2.2

4.9

Disease complex X. Another animal with an event at the same date. c

Udder X No

BL

  
 

Udder X Yes

8.8

5.3

14.8

 

Metabolic X No

BL

  
 

Metabolic X Yes

3.7

1.5

8.7

 

Lameness X No

BL

  
 

Lameness X Yes

1.9

1.0

3.4

 

Reproductive X No

BL

  
 

Reproductive X Yes

1.1

0.4

3.2

 

Other X No

BL

  
 

Other X Yes

8.5

2.6

27.9

  1. a Herd-level variable.
  2. b Baseline.
  3. c OR only comparable within disease complex.