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What is a control group?

What is a control group? Here are some definitions.

Noun
  1. (experiment) The group of test subjects left untreated or unexposed to some procedure and then compared with treated subjects in order to validate the results of the test.
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Examples
The possibly calming effect of having family present for the control group during the intervention could have played a part in the reaction.
Patients in the control group received standard care delivered by the community mental health teams.
Table 4 shows the relative mortality of this group of patients compared with the control group.
Direct evaluation cannot be done because very few ganzfeld studies have included a control group.
As healthcare providers, we often wonder whether it is ethical to use a control group or not.
Researchers tested their SARS vaccine on four African green monkeys, with another four in the control group.

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