A pharmaceutical company wanted to test a new antistress medication -- Stress-Ex  To do so, they placed an advertisement in the local business magazine asking for highly stressed business executives to take part in a clinical study  Forty such individuals signed up for the study  The participants were asked to rate their level of stress, and then they were placed in a room over a three-day period and given Stress-Ex at regular intervals  At the conclusion of the study, participants were once again asked to rate their level of stress  Thirty of the participants rated their stress level lower at the end of the study
On the basis of this study, Stress-Ex was deemed a success
there is no evidence that using greater quantities of Stress-Ex would reduce stress