Trends, Charts, and Maps

ClinicalTrials.gov currently lists 165,311 studies with locations in all 50 states and in 186 countries. ClinicalTrials.gov receives more than 98 million page views per month and 64,000 unique visitors daily (as of July 2013).

Contents

Locations of Registered Studies

This chart shows the distribution of locations for all studies registered on ClinicalTrials.gov.
Total N = 165,311 studies

(Data as of April 16, 2014)

Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie ColorLocation
    Non-U.S. Only (45%)
    U.S. Only (40%)
    Not Specified (9%)
    Both U.S. & Non-U.S. (6%)
* Not Specified: The location of the study was not provided by the Sponsor.
(Data as of April 16, 2014)

Locations of Recruiting Studies

This chart shows the distribution of locations for recruiting studies registered on ClinicalTrials.gov.
Total N = 32,644 studies

(Data as of April 16, 2014)

Recruiting Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie ColorLocation
    Non-U.S. Only (51%)
    U.S. Only (43%)
    Both U.S. & Non-U.S. (6%)
(Data as of April 16, 2014)

Map of Studies Registered on ClinicalTrials.gov

See Studies on a Map for an interactive map of studies that are registered on ClinicalTrials.gov.

Types of Registered Studies

This table shows the number and types of studies that are registered and for which results are available on ClinicalTrials.gov.

(Data as of April 16, 2014)

* A study may include more than one type of intervention (that is, 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 517 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 has indicated that such a trial includes a device not previously approved or cleared by the U.S. FDA for any use. These are not included in the count of trials with at least one device.
*** Results are only required to be submitted for certain trials. For example, results submission is generally not required for trials of drugs, biologics, or devices that have not been approved by FDA; observational studies; and trials completed before 2008.

N/A = not applicable

Number of Registered Studies Over Time

The graph below shows 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.

(Data as of April 16, 2014)
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 under the Uniform Requirements for Manuscripts Submitted to Biomedical Journals (URM) (September 2005).

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

(Data as of April 16, 2014)

Number of Registered Studies With Posted Results Over Time

The graph below shows 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 results submission requirements outlined in FDAAA.

(Data as of April 16, 2014)
Registered Studies With Posted Results Over Time Graph
(Data as of April 16, 2014)
This page last reviewed in August 2012