Skip to main content

Table 3 Results from the univariable logistic regression analysis of variables significantly (P ≤ 0.20) associated with Escherichia coli isolates (n = 95) with or without antimicrobial resistance (from 95 healthy or diarrheic calves from 85 Swedish dairy herds).

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

Variable Level E. coli with antimicrobial resistance E. coli without antimicrobial resistance P-value
Herd factors     
Age at sampling 0: 0-11 days 24 10  
  1: 12-21 days 13 16  
  2: ≥ 22 days 19 10 0.09*
Any respiratory syndromes 0: No 50 33  
  1: Yes 7 1 0.10
Herd size (no of cows) 0: < 55 14 17  
  1: 55-120 20 13  
  2: ≥ 121 21 6 0.04*
Time for separation of cow and calf 0: < 24 h after calving 33 14  
  1: 1-3 days after calving 12 10  
  2: > 3 days after calving 9 12 0.09*
Usage of DHS tablets to treat diarrhea 0: Never 40 21  
  1: Sometimes/Often 15 15 0.20*
Presence of virulence genes     
Presence of espP 0: No 11 19  
  1: Yes 15 3 0.002*
Presence of irp 0: No 12 19  
  1: Yes 14 3 0.003*
Presence of fyuA 0: No 13 18  
  1: Yes 13 4 0.02*
  1. * variables eligible for entering the multivariable analysis
\