Table 3.

Coefficients, P values, and ORs for the logistic regression models of the association between virulence factors and STEC isolates from serotypes reported in humansa

GeneModel 1Model 2
βPORβPOR
ehxA
espP
eae1.080.00082.930.550.17191.74
stx1
stx21.230.00013.410.860.01142.36
eae*stx21.720.0473NA
  • a The first model was obtained by using a backward-elimination procedure with a threshold of 5% significance. The second model was derived from the first one by using a forward procedure with a threshold of 5% significance to detect significant two-way interaction terms. β, coefficient;eae*stx2, interaction between eae andstx2; −, variables not significant at the 5% level and not included in the final models; NA, not applicable.