Exhibit 15. Strength of Evidence for All Literature Reviewed Guide to Patient and Family Engagement: Environmental Scan Report Type of DocumentNumberSystematic reviewsSystematic review of randomized controlled trials1Systematic review of descriptive studies (quantitative / qualitative)15Single evaluative studiesRandomized controlled trial3Nonrandomized controlled trial3Cohort / case-control study1Single site intervention (pre/post) / Case series study10Single site intervention (post only)8Single descriptive studiesMixed methods study (qualitative / quantitative)15Quantitative study26Descriptive or qualitative study37Case study / description of implementation65Scholarly articles or reviews42Other (e.g., PowerPoint® presentations, workshop summaries)10Return to Document Current as of May 2012 Internet Citation: Exhibit 15. Strength of Evidence for All Literature Reviewed: Guide to Patient and Family Engagement: Environmental Scan Report. May 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ptfamilyscan/ptfamilyex15.html