A measurement to assess whether a study treatment (medicine or vaccine) worked in a study; a measure of the expected effect of the study treatment; one of the main questions researchers are trying to answer in a study.
Clinical Trials
INTERNATIONAL VERSIONS OF THE SITE
Merck & Co, Inc, Rahway, NJ, USA, known as MSD outside of the United States and Canada, provides international versions of this site for both healthcare professionals and the general public.
Select a language below to be redirected to the MSD version of the site in your chosen language.