Terminated trials were excluded from the
analysis. Trials not industry sponsored and device trials were excluded.
* Phase II includes Phases I/II, II, IIa, IIb. Phase III includes Phase II/III and III.
** Final number to be determined in 2021.
Citation formats
Average number of subjects per drug trial started worldwide 2015-2020, by phase
Worldwide, there was an increase in the average number of subjects per clinical drug trial for each phase between 2019 and the end of 2020. This statistic shows the average number of subjects per clinical drug trial started worldwide between 2015 and November 2020, by trial phase.
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IQVIA. (February 22, 2021). Average number of subjects per clinical drug trial started worldwide from 2015 to 2020, by trial phase [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 21, 2026, from /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/
IQVIA. "Average number of subjects per clinical drug trial started worldwide from 2015 to 2020, by trial phase." Chart. February 22, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 21, 2026. /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/
IQVIA. (2021). Average number of subjects per clinical drug trial started worldwide from 2015 to 2020, by trial phase. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 21, 2026. /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/
IQVIA. "Average Number of Subjects per Clinical Drug Trial Started Worldwide from 2015 to 2020, by Trial Phase." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 22 Feb 2021, /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/
IQVIA, Average number of subjects per clinical drug trial started worldwide from 2015 to 2020, by trial phase ÌÇÐÄÆƽâ°æ, /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/ (last visited July 21, 2026)
Average number of subjects per clinical drug trial started worldwide from 2015 to 2020, by trial phase [Graph], IQVIA, February 22, 2021. [Online]. Available: /statistics/1249080/average-number-subjects-per-trial-started-by-phase-worldwide/
