Table 3 Descriptive statistics of the nominal predictor variables and their association to the gastric ulcers prevalence in pig herds
Variable (categories) | n1 | nn | n1/nna | P |
|---|---|---|---|---|
Environmental factors | ||||
Management issues | reported | not reported | 6/65 | 0.041 |
Flooring | straw bedding | slatted floor | 7/64 | 0.002 |
Duration of the transportation to the slaughterhouse | ≤ 1 h | 1-4 h | 18/53 | 0.055 |
Meteorological season | winter | spring/summer/autumn | 28/17/16/10 | 0.053 |
Genetics | PIC | DanBred | 4/35 | 0.247 |
Infections | ||||
Porcine reproductive and respiratory syndrome virus | no | yes | 50/21 | 0.246 |
Brachyspira hyodysenteriae | no | yes | 58/13 | 0.905 |
Mycoplasma hyopneumoniae | no | yes | 4/67 | 0.319 |
Salmonella Index | 1 | 2/3 | 33/15/18 | 0.128 |
Prophylaxis and treatments | ||||
Vaccination against intestinal lesions caused by Lawsonia intracellularis | no | yes | 50/12 | 0.473 |
Deworming | no | yes | 70/1 | 0.130 |
Antibiotic free production | no | yes | 70/1 | 0.107 |