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Table 9 Results for the GEE predicting positive fPCR status (> 1 × 103 genomes / mL) for cows that tested positive (≥ 50 EU in any one of 4 ELISA tests conducted in parallel) for antibody to MAP in a study on a NZ pastoral dairy farm over 4 seasons (2013–2017)

From: Control of Mycobacterium avium subsp. paratuberculosis infection on a New Zealand pastoral dairy farm

Input variable

Coefficient

OR

95% CI

p-valuea

Parityb

 Primparous

Ref

Ref

  

 Multiparous

−0.73

0.48

0.24–0.95

0.026

Study year

 2013–2014

Ref

Ref

  

 2014–2015

−0.97

0.38

0.07–2.17

0.278

 2015–2016

− 0.12

0.89

0.23–3.47

0.869

Interactiond

 Multiparous 2014–2015

1.54

4.65

0.76–28.46

0.097

 Multiparous 2015–2016

0.46

1.59

0.33–7.82

0.569

ICCe

 

0.110

−0.16 - 0.31

 

Variance within

 

0.113

  

Variance among

 

0.014

  
  1. aSignificance of coefficient
  2. bParity of cow defined as primiparous (≤ 2 years) and multiparous (> 2 years)
  3. cMilking season. Each season uses the preceding season as the referent
  4. dInteraction term between parity and milking season. Overall significance of the interaction term: < 0.0247
  5. eIntra class correlation coefficient