the referent. The outcomes (number of events; binary indicator) were assumed to have a binomial distribution, with the denominator equal to the number of possible events, and a logistic link was used. An overall post-estimation Wald test then evaluated whether the categorical variable for the mutually exclusive diagnostic groups was significant (defined as p < 0.05). With the exception of four missing responses for the PTSD Checklist, there were no other missing data.
