Evidence Hierarchy

• Systematic reviews• Randomized, controlled

clinical trials• Cohort study• Case controlled study• Case report

Frequently used Article Types:• Case Reports• Clinical Trial• Controlled Clinical Trial• Randomized Controlled Trial• Review• Systematic Review… and many more

Evidence Hierarchy in PubMed

Looking for Cohort Studies (or others) but are not finding them in the Filters list under Article Types?

Some article types are NOT listed in the Article Types filter:• Cohort Studies• Case-Control Studies• Longitudinal Studies• Retrospective Studies• Cross-Sectional Studies

Evidence Hierarchy in PubMed

So how do you search for Cohort Studies (or others) if they are not listed in the Article Types filter?

Example: Search for Cohort Studies

Instead of using the Article Types filter, limit your Search results to “Cohort Study” by including the phrase in the Search box