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Generally Phase III trials involve a period on placebo/medicine, a wash out period and then another period with placebo/medicine. This is to determine if the medicine works. Neither your or the researcher know when you are getting the medicine or the placebo. From this trial they determine the effectiveness of the medicine vs placebo. One would suppose that statistically more people would do better on the medicine but some do better on the placebo. If the compound works and is statistically better than placebo, they go on to Phase IV studies. Phase IV studies which break down the population by age and ethnicity are used to determine optional dosage for the different populations. John Cottingham ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn