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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 361,474 studies with locations in all 50 States and in 219 countries. Data as of December 20, 2020.

[2] Clinical Trials: As of December 20, 2020, ClinicalTrials.gov lists 282,477 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 December 20, 2020, ClinicalTrials.gov lists 77,439 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.