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
| Gene | Model 1
|
Model 2
|
||||
|---|---|---|---|---|---|---|
| β | P | OR | β | P | OR | |
| ehxA | − | − | − | − | − | − |
| espP | − | − | − | − | − | − |
| eae | 1.08 | 0.0008 | 2.93 | 0.55 | 0.1719 | 1.74 |
| stx1 | − | − | − | − | ||
| stx2 | 1.23 | 0.0001 | 3.41 | 0.86 | 0.0114 | 2.36 |
| eae*stx2 | − | − | − | 1.72 | 0.0473 | NA |
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 and stx2; −, variables not significant at the 5% level and not included in the final models; NA, not applicable.