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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
1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for control group
  • The other babies were the control group and were not shown the monkey photos again.
  • One group of volunteers then received eight weeks of training in meditation, while a control group did not.
  • None of the members of an untreated control group survived the four-month period over which the experiment was conducted.
  • Game players, it turned out, were no more aggressive than the control group.
  • The control group did not show activity in these parts of their brains when listening to the psalm.
  • When the data was unblinded, the researchers learned that the four who had died were in the control group.
  • Only by subtracting the improvement in a placebo control group could the actual value of the drug be calculated.
  • In other experiments, consumers who felt powerless and alone chose larger portions than participants in the control group.
  • Subjects came up with significantly more unique uses for the everyday items, than the control group who stared straight ahead.
  • Overall, the first music-exercising group experienced half as many falls as the control group.
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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