Predictor | Categories | OR | Std. Err. | z | P | Lower 95% CI | Upper 95% CI |
---|---|---|---|---|---|---|---|
b-a PPD reaction size | |||||||
<0 mm | 2.29 | 0.83 | 2.28 | 0.023 | 1.12 | 4.65 | |
0 mm | Ref. | ||||||
1-4 mm | 6.31 | 1.64 | 7.07 | <0.001 | 3.79 | 10.51 | |
5-9 mm | 14.57 | 3.66 | 10.66 | <0.001 | 8.90 | 23.85 | |
10-19 mm | 42.59 | 10.79 | 14.81 | <0.001 | 25.92 | 69.98 | |
>20 mm | 103.03 | 27.29 | 17.50 | <0.001 | 61.31 | 173.15 | |
Log(No. associated herds) | 2.27 | 0.19 | 9.76 | <0.001 | 1.92 | 2.67 | |
Breed | Non-dairy | Ref. | |||||
Dairy | 0.79 | 0.08 | −2.43 | 0.015 | 0.65 | 0.96 | |
Penultimate test results | Negative | Ref. | |||||
Severe interpretation positive | 3.98 | 0.93 | 5.93 | <0.001 | 2.52 | 6.28 | |
No previous test result | 1.08 | 0.17 | 0.48 | 0.629 | 0.79 | 1.48 | |
Constant | 0.02 | 0.01 | −14.95 | <0.001 | 0.01 | 0.03 | |
RE | ρa | 0.28 | 0.03 | 0.23 | 0.33 |