Source:http://linkedlifedata.com/resource/umls/id/C0009932
MSH: Groups that serve as a standard for comparison in experimental studies. They are similar in relevant characteristics to the experimental group but do not receive the experimental intervention.,NCI: In a clinical trial, the group that does not receive the new treatment being studied. This group is compared to the group that receives the new treatment, to see if the new treatment works.,NCI: A group used as a standard of comparison in a control experiment.