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Trends, Charts, and Maps

ClinicalTrials.gov currently lists 276,066 studies with locations in all 50 States and in 204 countries.

As of January 2018, ClinicalTrials.gov receives an average of more than 171 million page views per month and 93,000 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 June 19, 2018)
Total of 276,066 studies

Study Location Count Pie Chart

Legend for Recruiting Study location pie chart image
██ Non-U.S. only (48%)
██ U.S. only (35%)
██ Both U.S. and non-U.S. (5%)
██ Not provided (12%)

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 June 19, 2018)
Total of 47,412 recruiting studies

Recruiting Study Location Count Pie Chart

Legend for Recruiting Study location pie chart image
██ Non-U.S. only (57%)
██ U.S. only (38%)
██ Both U.S. and non-U.S. (5%)

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 posted 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 774 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 drug, biological, or device products not previously approved by the U.S. FDA for any use (if the Primary Completion Date is before January 18, 2017). See FDAAA 801 and the Final Rule for further information.

N/A = not applicable

Number of Registered Studies Over Time

The graph and table below show the total number of studies posted on ClinicalTrials.gov since 2000, based on the First Posted 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 (ICMJE) began requiring trial registration as a condition of publication (September 2005)

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

Number of Registered Studies by Year (as of June 19, 2018)


ClinicalTrials.gov was first launched on February 29, 2000 with 1,255 studies available
As of June 19, 2018

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 Posted date. ClinicalTrials.gov launched its results database in September 2008, at which time sponsors or investigators could begin submitting results for their registered studies. The results database was first 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

Number of Registered Studies With Posted Results by Year (as of June 19, 2018)


ClinicalTrials.gov Results Database was launched in September 2008, but initially held no results
As of June 19, 2018
This page last reviewed in March 2018