Description and model selection criteria.

aAll correlations were in infected subjects.bDIC (deviance information criteria) is a generalization of AIC in a Bayesian setting. DIC was not applicable (NA) in model 4, which assumed a correlation between more than two tests.cAIC (akaike information criteria) were used to evaluate goodness of model fit and to compare models.A difference in DIC or AIC of more than 10 indicated definite support to the model with the lower value, while a difference of between 5 and 10 was considered substantial, and less than 5 inconclusive.