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Table 4 Results of the mixed linear regression model to estimate the association between the bulk tank ODR and individual ODR values from serum samples of 374 cows and first season grazers

From: Comparison of diagnostic methods for assessment of Ostertagia ostertagi exposure in Norwegian dairy herds

Variables

 

Coefficient

95% CI

Std.error

p-value

n

Bulk tank ODR

 

0.59

(0.37–0.80)

0.11

< 0.001

20

Group

       
 

First season grazers

 

Baseline

   

188

 

First lactation

 

0.10

(0.04–0.16)

3.24

0.001

82

 

Second lactation

 

0.01

(-0.06–0.08)

0.27

0.784

57

 

≥ 3 lactations

 

-0.07

(-0.14–0.01)

-1.79

0.073

52

Constant

  

0.18

(0.03–0.32)

0.07

0.016

 

Random effect variance

      
 

Herd

 

0.00

(0.00–0.01)

0.00

  
  1. CI: Confidence interval ODR: Optical density ratio
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Acta Veterinaria Scandinavica

ISSN: 1751-0147