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Clinical Trials by the Numbers

REGISTERED STUDIES¹

CLINICAL TRIALS²

OBSERVATIONAL STUDIES³

COUNTRIES¹

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Sources

[1] Registered Studies, Countries: ClinicalTrials.gov currently lists 348,494 studies with locations in all 50 States and in 216 countries. Data as of August 10, 2020.

[2] Clinical Trials: As of August 10, 2020, ClinicalTrials.gov lists 273,051 Interventional Studies (clinical trials). Interventional Study, a type of clinical study in which participants are assigned to groups that receive one or more intervention/treatment (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes. The assignments are determined by the study's protocol. Participants may receive diagnostic, therapeutic, or other types of interventions.

[3] Observational Study: As of August 10, 2020, ClinicalTrials.gov lists 73,913 Observational Studies. Observational Study, a type of clinical study in which participants are identified as belonging to study groups and are assessed for biomedical or health outcomes. Participants may receive diagnostic, therapeutic, or other types of interventions, but the investigator does not assign participants to a specific interventions/treatment. A patient registry is a type of observational study.