Changes in resources, length and participation of U.S. clinical trials between 1999 and 2005

This statistic shows the changes in the resources, length and participation of clinical trials in the United States between 1999 and 2005. In 1999, a clinical trial lasted 460 days, whereas in 2005, a clinical trial lasted 780 days.

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Procedures per trial protocol (median)
(e.g. bloodwork, routine exams, x-rays, etc.)
- -
Clinical trial staff work burden
(in work-effort units)
- -
Length of clinical trial (days) - -
Clinical trial-participant enrollment rate
(% of volunteers meeting trial criteria)
- -
Clinical trial-participant retention rate
(% of participants completing trial)
- -
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