Search for the highest quality evidence. Levels of evidence vary depending on how the evidence was gathered and tested. Clinicians use various hierarchies to rate quality of evidence. The highest level of evidence are listed first. Levels one through three constitute appraised or filtered levels, while levels four through eight are unfiltered. The chart in the box below this indicates where you should search for each level of evidence using Miami University databases.
Critically Appraised Sources
Randomized Controlled Trials
Case Control Studies
Case Reports/Case Series
Background Information & Expert Opinion
These videos give additional information about levels of evidence and the evidence-based practice pyramid: