Table 10.

GEE prediction of probability of a positive fPCR test result (> 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 (2013–2016)

Predicted probability (95% CI) of testing fPCR positive
Season	Primiparous	Multiparous	p-value of difference
2013–2014	48.1% (24.2–95.4)	20.3% (14.6–28.1)	0.026
2014–2015	18.3% (3.9–86.1)	35.9% (23.0–56.1)	0.413
2015–2016	42.9% (33.3–88.3)	28.7% (13.0–63.5)	0.580