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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Clin Pharmacol Ther. 2010 Jan 20;87(3):286–293. doi: 10.1038/clpt.2009.222

Figure 1. Cumulative proportion of volunteers stating expected payment amounts for each study.

Figure 1

While payment estimates were significantly lower for the Investigational Drug Study, the other three studies were almost indistinguishable with the exception that the Malaria Challenge study yielded a few significantly higher estimates than any of the other studies.