Table 5 GEE prediction of probability of a positive ELISA test result (≥ 50 EU in any one of 4 ELISA tests conducted in parallel) for primiparous compared to multiparous cows over 4 years of whole herd testing for MAP infection on a NZ pastoral dairy farm over 4 seasons (2013–2017)
Predicted probability (95% CI) of testing ELISA positive | |||
|---|---|---|---|
Season | Primiparous | Multiparous | p-value of difference |
2013–2014 | 15.7% (11.1–22.1) | 42.8% (37.1–49.4) | < 0.001 |
2014–2015 | 3.8% (2.1–6.8) | 15.6% (12.8–19.0) | < 0.001 |
2015–2016 | 7.8% (5.0–11.9) | 8.1% (6.4–10.3) | 0.870 |
2016–2017 | 2.6% (1.2–5.3) | 2.6% (1.7–4.0) | 0.946 |