Purpose: To identify the impact of patient and public involvement (PPI) on health and social care research.
Sample: A systematic search of electronic databases and health libraries was undertaken from 1995 to 2009. Data were extracted and quality assessed utilizing the guidelines of the NHS Centre for Reviews and Dissemination 2009 and the Critical Appraisal Skills Program (CASP). Grey literature was assessed using the Dixon-Woods et al. (2005) checklist
Results: A total of 66 studies reporting the impact of PPI on health and social care research were