Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

*Evidence-Based Medicine Resources

This guide focused on the "acquire" stage of evidence-based medicine and the resources and search strategies to support this process.

Models for Levels of Evidence

Evidence is arranged into levels or a hierarchy (sometimes displayed as a pyramid), and studies are assigned to different levels based on the methodological quality of their design, and validity. There are several evidence rating scales available to use, including:

Levels of Evidence by Study Type

Evidence Level Study Type
One Systematic review or meta-analysis of all relevant randomized trials (RCTs)
Two Well-designed RCTs
Three Well-designed controlled trials without randomization
Four Well-designed case-control and cohort studies
Five Systematic review of descriptive and qualitative studies
Six A single descriptive or qualitative study
Seven The opinion of authorities and/or reports of expert committees

 

Connect with the MCPHS Libraries via Social Media: Twitter Instagram