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Background: Patient-centered care is strongly advocated as a key for improving the quality of healthcare. Research examining the impact of patient-centered care in healthcare has concluded that there are demonstrable albeit inconsistent relationships between patient experience, quality of care, and healthcare outcomes. Knowledge of the impact of patient-centered care in the treatment of substance use disorder is limited. The aim of this review was to assess relationships between indicators of patient-centered care (satisfaction and patient-reported experience measures) and patient outcomes (substance use, psychological wellbeing, and service use) among people attending treatment for substance use disorder. Methods: A systematic electronic literature search of a range of databases was conducted with variations of the search terms ‘patient-centered care’, ‘substance use disorders’, and residential or community specialist ‘treatment’. The populations, interventions and outcomes were summarized and described according to the PRISMA statement. Results: A total of 25 articles were identified, of which only five included a patient-centered indicator other than satisfaction. Indicators of patient-centered care showed a generally positive association with improved outcomes, particularly between satisfaction with treatment and substance use. Nonetheless, mixed and contradictory results were not uncommon, more so for psychological wellbeing outcomes. Conclusions: There were demonstrable relationships between patient-centered indicators and outcomes for people receiving treatment for substance use disorder. However, conclusions are limited due to underrepresentation of patient-reported experience measures. Further research in the area is needed involving comparisons of patient centered indicators with outcomes and use of patient-reported experience measures together with satisfaction. Registration number: CRD42018092829

Aim Health literacy is one's ability to use cognitive and social skills to access, understand and appraise health information. Despite poor health outcomes of people living with mental illness there is limited research assessing their health literacy. This systematic review aims to synthesise research on health literacy rates, conceptualizations, and outcomes of people living with mental illness, including substance use disorders. This will provide insights into how health literacy might be targeted to reduce these health inequities. Methods A search of published literature in multiple databases up until February 2019 was conducted. One reviewer screened the titles, abstracts and keywords of identified publications and the eligibility of all full‐text publications were assessed for inclusion along with a second reviewer. Both reviewers independently rated the quality of the included studies. Results Fourteen studies were included in the review. Rates and measures of health literacy varied. Low health literacy and health literacy weaknesses were identified. There is a lack of research on the relationship between health literacy and other outcomes, particularly health service engagement. Conclusion The review highlights the high rates of low health literacy within this population compared with general populations. Most studies used a functional health literacy measure, despite its limitations, with only a few using multidimensional measures. Overall, there is limited research examining the impact that this populations health literacy has on their recovery and how it affects them over time. The review emphasizes the importance of practitioners assessing and targeting health literacy needs when working with this population.