Summary of associations of gene targets with different groupings of isolates based on the Pearson Chi-square value (χ2) and the odds ratio (OR).

Empty cells mean no significant association.
a Chi-square value. Asterisks indicate the level of significance
*** is P<0.001
** is 0.001
* is 0.01
b Odds-ratio (OR) and 95% confidence interval (CI).
c One quadrant of the 2x2 contingency table contains a zero. For calculation of the odds-ratio the zero is replaced by 1. The given odds ratio value is the minimal value for that specific gene. No confidence interval is calculated.
d No statistics were calculated because variable (gene) is a constant (i.e. does not occur among eae-negative isolates).
Summary of associations of gene targets with different groupings of isolates based on the Pearson Chi-square value (χ2) and the odds ratio (OR).