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Table 2 Results from the univariable logistic regression analysis of variables significantly (P ≤ 0

From: Antimicrobial resistance and virulence factors in Escherichia coli from swedish dairy calves

Variable Level Healthy calves Diarrheic calves P-value
Herd factors     
Breed 0: Swedish red and white 18 33  
  1: Swedish Holstein 21 21  
  2: Other 0 1 0.15*
Age at weaning 0: 6-8 weeks of age 22 20  
  1: 9-11 weeks of age 7 15  
  2: 12-16 weeks of age 7 13 0.20*
Proportion of dead calves/20 born calves 0: 0% 24 19  
  1: 5% 11 12  
  2: ≥ 10% 4 18 0.01
Proportion of calves having diarrhea/20 born calves 0: < 5% 16 1  
  1: 5-20% 17 7  
  2:>20% 6 42 < 0.001
Age at sampling 0: 0-11 days 11 23  
  1: 12-21 days 18 13  
  2: ≥ 22 days 10 19 0.07*
Herd size (no of cows) 0: < 55 21 10  
  1: 55-120 14 19  
  2: ≥ 121 4 25 < 0.001*
Milk calf feeder? 0: No 28 28  
  1: Yes 10 26 0.03*
Usage of other antibiotics to treat diarrhea 0: Never 30 20  
  1: Sometimes/Often 7 33 < 0.001
Antimicrobial resistance     
Resistant to ampicillin 0: No 34 35  
  1: Yes 7 19 0.05*
Resistant to streptomycin 0: No 27 26  
  1: Yes 14 28 0.08*
Resistant to tetracycline 0: No 36 29  
  1: Yes 5 25 < 0.01*
Resistant to sulphonamide 0: No 34 31  
  1: Yes 7 23 < 0.01*
Multiresistant (resistant to at least three antibiotics (Am, Sm, Tc and/or Su)) 0: No 37 37  
  1: Yes 4 19 < 0.01
Presence of virulence genes     
Presence of terZ 0: No 24 1  
  1: Yes 11 10 < 0.01
Presence of astA 0: No 28 8  
  1: Yes 5 5 0.09
Presence of EAST 0: No 33 37  
  1: Yes 6 18 0.06*
  1. * variables eligible for entering the multivariable analysis
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