Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The process of deriving SNOMED CT terms from clinical trial eligibility criteria. 42,131 clinical entitieswere extracted from the eligibility criteria of 1,587 clinical trials. A simplified list of 4,260 clinical entities wasgenerated following manual review and filtration, and this list was mapped first to 3,294 UMLS concepts, and then to1,991 SNOMED CT variables, of which 304 variables occur in more than 1% of all trials (i.e., 15 trials).
