This statistic shows the complexity of clinical trials comparing designs and procedures for the periods 2001-2005 and 2011-2015. Between 2001-2005, there was a mean number of 31 eligibility criteria while between 2011-2015 the number was 50. This was an increase in complexity of 61 percent.
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PhRMA. (December 15, 2020). Increase in clinical trials' complexity between 2001-2005 and 2011-2015 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 22, 2026, from /statistics/732558/complexity-of-clinical-trials-increase/
PhRMA. "Increase in clinical trials' complexity between 2001-2005 and 2011-2015." Chart. December 15, 2020. ÌÇÐÄÆƽâ°æ. Accessed July 22, 2026. /statistics/732558/complexity-of-clinical-trials-increase/
PhRMA. (2020). Increase in clinical trials' complexity between 2001-2005 and 2011-2015. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 22, 2026. /statistics/732558/complexity-of-clinical-trials-increase/
PhRMA. "Increase in Clinical Trials' Complexity between 2001-2005 and 2011-2015." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 15 Dec 2020, /statistics/732558/complexity-of-clinical-trials-increase/
PhRMA, Increase in clinical trials' complexity between 2001-2005 and 2011-2015 ÌÇÐÄÆƽâ°æ, /statistics/732558/complexity-of-clinical-trials-increase/ (last visited July 22, 2026)
Increase in clinical trials' complexity between 2001-2005 and 2011-2015 [Graph], PhRMA, December 15, 2020. [Online]. Available: /statistics/732558/complexity-of-clinical-trials-increase/
