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Table 3 Incidence of bacteriocin producing and non-producing strains among UTI and control strains in E. coli phylogroups.

From: Bacteriocin synthesis in uropathogenic and commensal Escherichia coli: colicin E1 is a potential virulence factor

E. coli phylogroup A
  UTI (n = 128) Control (n = 70) statistical significance between UTI and control*
Producers 79 (61.7%) 37 (52.9%) -**
Non-producers 49 (38.3%) 33 (47.1%)  
E. coli phylogroup B1
  UTI (n = 25) Control (n = 11) statistical significance between UTI and control*
Producers 7 (28%) 7 (63.6%) p = 0.04
Non-producers 18 (72%) 4 (36.4%)  
E. coli phylogroup B2
  UTI (n = 173) Control (n = 213) statistical significance between UTI and control*
Producers 86 (49.7%) 110 (51.6%) -**
Non-producers 87 (50.3%) 103 (48.4%)  
E. coli phylogroup D
  UTI (n = 85) Control (n = 67) statistical significance between UTI and control*
Producers 54 (63.5%) 41 (61.2%) -**
Non-producers 31 (36.5%) 26 (38.8%)  
  1. *statistical methods derived from the binomial distribution were used (see Methods, χ2 = 3.41, p = 0.05)
  2. **not statistically significant