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.
For the Clinical Studies search, choose from the categories: Therapy, Diagnosis, Etiology, Prognosis, or Clinical Prediction Guides (see the image below).
Clinical Studies: Scope
Clinical Studies scope are as:
Broad: Sensitive search – It's a more comprehensive search that includes relevant citations but probably less relevant; will retrieve more (default) Narrow: Specific search – will get more precise, relevant citations but less retrieval
Apply Filter & Scope Options to Search Results
Search by applying Filter and Scope:
Enter your search terms in the search bar.
Adjust the Filter category and selected Filter(s) as needed.
Select a Scope: Narrow (specific search) or Broad (sensitive search).
Changing filter settings will automatically search with the new filter applied.
Preview the first five results for your search on the Clinical Queries page.
To view all results, click the link to "See all results in PubMed.
The images below illustrate before and after applying Filter and Scope in search for clinical studies on "diabetes type 2":