A systematic review of the prevalence of comorbid mental health disorders in people presenting for substance use treatment in Australia

Issues The aim of this paper was to conduct a systematic review of the prevalence of comorbid mental health conditions in people accessing treatment for substance use in Australia. Approach A systematic review identified studies meeting the following eligibility criteria: reporting original data published in English; sample presenting for substance use treatment in Australia; assessing the prevalence of mental health and substance use conditions and reporting the percentage of participants with co-occurring mental health and substance use conditions. A narrative analysis was conducted because of the heterogeneity of methods used to assess key outcome variables and small number of studies assessing particular mental health outcomes. The abstracts of 1173 records were screened, and 59 full articles were assessed for eligibility. Eighteen studies were included in the review. Key Findings Prevalence estimates of current mental disorders in substance use treatment clients varied (47 to 100%). Mood and anxiety disorders were particularly prevalent, with the prevalence of current depression ranging from 27 to 85% and current generalised anxiety disorder ranging from 1 to 75%. Implications The high prevalence of mood and anxiety disorders in substance use treatment settings indicates a need for clinicians to screen and assess for these disorders as part of routine clinical care, and be familiar with evidence-based management and treatment strategies. Conclusion Although further studies are required to determine the prevalence of the full range of mental health disorders in this population, these findings emphasise the high prevalence of comorbid mental disorders are among individuals accessing substance use treatment in Australia. [Kingston REF, Marel C, Mills KL. A systematic review of the prevalence of comorbid mental health disorders in people presenting for substance use treatment in Australia. Drug Alcohol Rev 2016;00:000–000]