Variable | OR (crude) | SE | z | P value | 95 % CI |
---|---|---|---|---|---|
Quarter | 0.918 | 0.048 | −1.65 | 0.100 | 0.828; 1.016 |
Month | 1.223 | 0.098 | 2.52 | 0.012 | 1.046; 1.430 |
Herd size | 0.910 | 0.002 | −0.31 | 0.758 | 0.996; 1.003 |
Management system | 1.254 | 0.150 | 1.89 | 0.059 | 0.992; 1.585 |
Breed | 1.241 | 0.094 | 2.85 | 0.004 | 1.069; 1.439 |
Cow type | 1.333 | 0.159 | 2.40 | 0.016 | 1.054; 1.685 |
Cow origin | 0.987 | 0.115 | −0.11 | 0.914 | 0.785; 1.241 |
Age (years) | 2.041 | 0.243 | 5.99 | <0.001 | 1.616; 2.577 |
Parity | 2.081 | 0.271 | 5.62 | <0.001 | 1.611; 2.686 |
BCS | 0.999 | 0.069 | −0.01 | 0.991 | 0.873; 1.144 |
Washing of teat | 0.755 | 0.100 | −2.11 | 0.035 | 0.582; 0.980 |
Pre-striping before milking | 0.359 | 0.155 | −2.37 | 0.018 | 0.154; 0.836 |
Washing hands before milking | 0.314 | 0.085 | −4.28 | <0.001 | 0.184; 0.533 |
Heifer and cow | 0.245 | 0.121 | −2.86 | 0.004 | 0.093; 0.643 |
Replacement heifers | 0.926 | 0.130 | −0.55 | 0.584 | 0.703; 1.219 |
Feeding after milking | 2.787 | 1.203 | 2.37 | 0.018 | 1.196; 6.496 |