Regional variation in the prevalence of E. coli O157 in cattle: a meta-analysis and meta-regression.

Manual forward selection, starting with variables that were more strongly associated with prevalence in univariable analyses, was applied and variables were retained in the multivariable model if p<0.2.The variables that were highly significant (p<0.05) in multivariable meta-regression model were considered as building blocks for interaction terms.

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The associations of the variables specimen (p = 0.066), health status (p = 0.080) and isolation media (p = 0.096) were borderline significant ( Table 3 ).

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