Predictors of service use of patients with co-morbid mental health and substance use disorders across seven European sites

The purpose of this study was to identify factors which predict service use over time in patients with co-morbid mental health and substance use disorders (dual diagnosis). Three hundred and fifty-two patients with dual diagnosis were recruited from acute psychiatric inpatient units at seven European sites. At baseline and 9 months follow-up, socio-demographic and clinical information, as well as information concerning the use of treatment services was collected. Predictors for use of psychiatric and substance misuse services at follow-up were studied using multinomial logistic regression models. At follow-up, patients with dual diagnosis used psychiatric services significantly more than substance use services. The main predictor of service use at follow-up is influenced by the study site and not by psychopathology. More networking and signposting are needed especially for substance misuse services. Service provision and planning can improve access of vulnerable populations even when psychopathology improves.