Variable | Category | OR | SE | z | p | 95% CI for OR |
---|---|---|---|---|---|---|
Herd size | ||||||
Ā | ā¤10 cows | Ref | Ā | Ā | Ā | Ā |
Ā | >10 cows | 3.1 | 1.0 | 3.74 | <0.001 | 1.7 ā 5.7 |
Breed | ||||||
Ā | Local | Ref | Ā | Ā | Ā | Ā |
Ā | Cross | 16.4 | 8.3 | 5.55 | <0.001 | 6.1 ā 44.1 |
Milking mastitic cow last | ||||||
Ā | Yes | Ref | Ā | Ā | Ā | Ā |
Ā | No | 2.0 | 0.6 | 2.53 | 0.011 | 1.2 ā 3.5 |
Bedding material | ||||||
Ā | Yes | Ref | Ā | Ā | Ā | Ā |
Ā | No | 2.8 | 0.9 | 3.24 | 0.001 | 1.5 ā 5.3 |
Parity | ||||||
Ā | 1 | Ref | Ā | Ā | Ā | Ā |
Ā | 2 | 1.2 | 0.5 | 0.48 | 0.629 | 0.5 ā 2.9 |
Ā | 3 | 3.2 | 1.5 | 2.46 | 0.014 | 1.3 ā 8.1 |
Ā | ā„4 | 24.8 | 12.2 | 6.50 | <0.001 | 9.4 ā 65.2 |
Stage of lactation | ||||||
Ā | Early (1 ā 2 months) | Ref | Ā | Ā | Ā | Ā |
Ā | Mid (3 ā 6 months) | 0.3 | 0.1 | ā4.17 | <0.001 | 0.1 ā 0.5 |
Ā | Late (ā„7 months) | 0.7 | 0.2 | ā0.99 | 0.323 | 0.4 ā 1.4 |
Udder & leg hygiene | ||||||
Ā | Slightly dirty | Ref | Ā | Ā | Ā | Ā |
Ā | Moderately dirty | 2.6 | 0.8 | 3.27 | 0.001 | 1.5 ā 4.7 |
Ā | Very dirty | 8.7 | 4.0 | 4.73 | <0.001 | 3.5 ā 21.3 |
Teat end shape | ||||||
Ā | Pointed | Ref | Ā | Ā | Ā | Ā |
Ā | Round | 3.2 | 1.0 | 3.72 | <0.001 | 1.7 ā 5.9 |
Ā | Flat | 7.6 | 2.8 | 5.57 | <0.001 | 3.7 ā 15.7 |
Constant | Ā | Ā | Ā | ā7.44 | <0.001 | Ā |