Use this Library Research Guide to help locate evidence-based resources including articles, information on research appraisal, statistics, evidence translation, clinical practice tools, informatics and professional resources.
Levels of Evidence
Experimental study, randomized controlled trial (RCT)
Systematic review of RCTs, with or without meta-analysis
Systematic review of a combination of RCTs and quasi-experimental, or quasi-experimental studies only, with or without meta-analysis.
Systematic review of a combination of RCTs, quasi-experimental and non-experimental, or non-experimental studies only, with or without meta-analysis.
Qualitative study or systematic review, with or without meta-analysis
Opinion of respected authorities and/or nationally recognized expert committees/consensus panels based on scientific evidence.
- Clinical practice guidelines
- Consensus panels
Based on experiential and non-research evidence.
- Literature reviews
- Quality improvement, program or financial evaluation
- Case reports
- Opinion of nationally recognized expert(s) based on experiential evidence