Here is a website with some interesting statistics on...

Here is a website with some interesting statistics on research:

http://www.ciscrp.org/professional/facts_pat.html

And here is an interesting stat from this page in regards to retention rates:

4.In an analysis of 25,855 study volunteers in the United States 73.2% of participants completed Overall clinical trials (Phases I-IV), 75.4% completed Phase I clinical trials, 69.7% completed Phase II/III clinical trials and 93.8% completed Phase IV clinical trials. (CenterWatch, 2003)

83% retention in a phase II trial is considerable to say the least, compared to the average of 69.7%. What is more is that this retention fact pertains to completion of original trial! What Prana has achieved is 95% retention for full duration of the trial and 83% retention into an extension trial. I deem this highly encouraging in my humble opinion.