Polysubstance use in young people accessing residential and day treatment services for substance use: substance use profiles, psychiatric comorbidity, and treatment completion

Different combinations of substance use and mental health problems require different treatment approaches. Our study aimed to (i) identify the shared substance use classes among young people at treatment admission, (ii) determine which mental health symptoms, quality of life (QOL) and service types were associated with the identified substance use classes, and (iii) prospectively determine which substance use classes and service types were more likely to complete treatment.