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control group

noun
1.
(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
1950-1955
1950-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

noun
1.
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
noun

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

Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, 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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