Trends, Charts, and Maps

ClinicalTrials.gov currently lists 216,408 studies with locations in all 50 States and in 193 countries.

As of October 2015, ClinicalTrials.gov receives an average of more than 207 million page views per month and 65,000 unique visitors daily.

Contents

Locations of Registered Studies

The chart below shows the distribution of locations for all studies registered on ClinicalTrials.gov.

Percentage of Registered Studies by Location (as of May 26, 2016)
Total N = 216,408 studies

Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie ColorLocation
color Non-U.S. only (46%)
color U.S. only (37%)
color Not provided (11%)
color Both U.S. and non-U.S. (6%)

Locations of Recruiting Studies

The chart below shows the distribution of locations for recruiting studies registered on ClinicalTrials.gov.

Percentage of Recruiting Studies by Location (as of May 26, 2016)
Total N = 38,342 studies

Recruiting Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie Color Location
color Non-U.S. only (54%)
color U.S. only (40%)
color Both U.S. and non-U.S. (6%)

Map of Studies Registered on ClinicalTrials.gov

The See Studies on Map page provides an interactive map of studies that are registered on ClinicalTrials.gov.

Types of Registered Studies

The table below shows the number and types of studies that are registered and have results available on ClinicalTrials.gov.

* A study may include more than one type of intervention, meaning that a single study may be counted more than once. Because of this, the sum of counts by type of intervention do not equal the total number of interventional studies.
** A total of 639 applicable device clinical trials were submitted as "delayed posting" under the Food and Drug Administration Amendments Act of 2007 (FDAAA). That is, the Responsible Party indicated that the trial includes a device not previously approved or cleared by the Food and Drug Administration (U.S. FDA) for any use. These trials are not included in the counts of trials with at least one device.
*** Results are required to be submitted only for certain studies. For example, results submission is generally not required for observational studies; trials completed before 2008; and trials that include drugs, biologics, or devices not previously approved by the U.S. FDA for any use. See FDAAA 801 Requirements for further information.

N/A = not applicable

Number of Registered Studies Over Time

The graph and table below show the total number of studies registered on ClinicalTrials.gov since 2000, based on the First Received date. The first version of ClinicalTrials.gov was made available to the public on February 29, 2000.

Registered Studies Over Time Graph

Key:

ICMJE: Indicates when the International Committee of Medical Journal Editors began requiring trial registration as a condition of publication (September 2005)

FDAAA: Indicates when the expanded registration requirements of FDAAA began and were implemented on ClinicalTrials.gov (December 2007)

Number of Registered Studies With Posted Results Over Time

The graph and table below show the number of registered studies with results posted on ClinicalTrials.gov, based on the Results First Received date. ClinicalTrials.gov launched its results database in September 2008, at which time sponsors or investigators were allowed to begin submitting results for their registered studies. The results database was developed to accommodate the results submission requirements outlined in FDAAA. See About the Results Database for more information.

Registered Studies With Posted Results Over Time Graph
This page last reviewed in February 2016