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.
Percentage of observational research studies registered at clinicaltrials.gov with respect to the total number of registered studies. Emerging clinical trial markets such as Asia and Middle East exhibit lower percentage of observational studies. Greater than 50% of registered studies are observational for GCC countries except Saudi Arabia (34%) and UAE (37%)
