Mastery matters: consumer choice, psychiatric symptoms and problematic substance use among adults with histories of homelessness.

Previous research demonstrated the importance of consumer choice and mastery to residential stability and psychiatric functioning for adults with histories of homelessness. In the present study, we investigated whether these relationships hold, even in the context of problem-related substance misuse. Questionnaire data were collected in Ireland from 101 residents of long-term homeless accommodation in 2010. Hayes' PROCESS macro for mediation and moderation analysis in SPSS was employed to test our hypotheses. Findings demonstrated that the indirect effect of choice through mastery on psychiatric functioning was stronger for individuals with more recent problem-related substance use than for those with no or distant histories of problem-related substance use. Our findings confirm that consumer choice in housing and services is important to homeless services users' recovery experiences. Because of its relationship with mastery, consumer choice in housing and services protects homeless services users' psychiatric functioning, especially when substance use-related choices have had negative consequences. Our findings suggest that if homeless services take away consumer choice when substance use causes problems, they may actually undermine, rather than foster, service users' psychiatric functioning.