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Table 3 Final model describing explanatory variables and random effects of log transformed BioX ELISA optical density measurements (ODC%). The marginal R2 was 39% and conditional R2 was 61%

From: Mycoplasma bovis antibody dynamics in naturally exposed dairy calves according to two diagnostic tests

Variables

Variance

95% confidence interval

 

Random effects

 Animal

0.28

0.13–0.38

 

 Residuals

0.47

0.37–0.54

 
  

Estimate

SE

p-value

Fixed effects

 Intercept

 

2.55

0.26

<  0.001

 Age days (linear)

 

14.68

3.93

<  0.001

 Age days (quadratic)

 

−8.16

2.27

<  0.001

 Herd 1

 

0

 

 Herd 2

 

0.30

0.30

0.311

 Herd 3

 

−0.10

0.30

0.753

 Herd 4

 

0.37

0.31

0.229

 Age days (linear)*Herd 1

 

0

 

 Age days (linear)*Herd 2

 

−5.93

4.27

0.165

 Age days (linear)*Herd 3

 

7.11

4.59

0.123

 Age days (linear)*Herd 4

 

−8.15

5.06

0.108

 Age days (quadratic)*Herd 1

 

0

 

 Age days (quadratic)*Herd 2

 

4.80

2.65

0.072

 Age days (quadratic)*Herd 3

 

13.42

3.19

<  0.001

 Age days (quadratic)*Herd 4

 

13.95

3.31

<  0.001