Variable | n | Odds ratio | P value | 95% CI1 | Wald2 |
---|---|---|---|---|---|
Free stall type | |||||
Insulated | 221 | Referent | 0.09 | ||
Partly insulated | 60 | 0.31 | 0.06 | 0.09–1.05 | |
Non-insulated | 13 | 0.14 | 0.07 | 0.02–1.20 | |
Ventilation | |||||
Natural | 84 | Referent | |||
Mechanical3 | 210 | 0.18 | <0.01 | 0.06–0.54 | |
Herd size | |||||
50–65 | 125 | Referent | 0.07 | ||
66–99 | 115 | 0.97 | 0.94 | 0.41–2.26 | |
≥100 | 54 | 2.60 | 0.04 | 1.03–6.58 | |
Enlargement4 within 3 years | |||||
No | 184 | Referent | |||
Yes | 110 | 3.32 | <0.01 | 1.58–6.98 | |
Open or closed herd | |||||
Closed herd | 194 | Referent | |||
Open herd | 100 | 4.91 | <0.01 | 2.32–10.37 | |
Fields in organic farming | |||||
No | 270 | Referent | |||
Yes | 24 | 3.75 | 0.02 | 1.21–11.66 | |
Milk yield5 | 294 | 0.73 | 0.18 | 0.45–1.16 | |
Region | |||||
Southern | 38 | Referent | 0.56 | ||
Western | 138 | 1.75 | 0.40 | 0.48–6.37 | |
Eastern | 62 | 2.10 | 0.30 | 0.51–8.65 | |
Northern | 56 | 2.77 | 0.17 | 0.65–11.82 | |
_Constant | 1.88 | 0.80 | 0.02–218.92 |