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control group

(in an experiment or clinical trial) a group of subjects closely resembling the treatment group in many demographic variables but not receiving the active medication or factor under study and thereby serving as a comparison group when treatment results are evaluated.
Origin of control group
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for control group
Contemporary Examples
Historical Examples
  • These cases were compared with a control group chosen at random.

    Adenoids and Diseased Tonsils Margaret Cobb Rogers
  • The average gain of the control group was 9113 pounds and the median 68.

    Adenoids and Diseased Tonsils Margaret Cobb Rogers
  • There is no control group, and consequently, no way of knowing whether the improvement was due to the removal of the defect.

    Adenoids and Diseased Tonsils Margaret Cobb Rogers
  • As a control group, there were chosen 45 boys who had had no operation, and who lived and worked under the same conditions.

    Adenoids and Diseased Tonsils Margaret Cobb Rogers
  • The average of the boys in the control group was 7421 and for the first group after operation 7406.

    Adenoids and Diseased Tonsils Margaret Cobb Rogers
British Dictionary definitions for control group

control group

any group used as a control in a statistical experiment, esp a group of patients who receive either a placebo or a standard drug during an investigation of the effects of another drug on other patients
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for control group

in a test or trial, a group that does not receive the new treatment being studied and which is compared to the group that does receive the new treatment

Usage Note

medicine's 21st Century Lexicon
Copyright © 2003-2014, LLC
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control group in Medicine

control group n.
A group used as a standard of comparison in a control experiment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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