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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 variableCoefficientOR95% CIp-valuea
Parityb
 PrimparousRefRef  
 Multiparous−0.730.480.24–0.950.026
Study year
 2013–2014RefRef  
 2014–2015−0.970.380.07–2.170.278
 2015–2016− 0.120.890.23–3.470.869
Interactiond
 Multiparous 2014–20151.544.650.76–28.460.097
 Multiparous 2015–20160.461.590.33–7.820.569
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