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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
Patients in the control group received standard care delivered by the community mental health teams.
The possibly calming effect of having family present for the control group during the intervention could have played a part in the reaction.
The control group was maintained in a similar chamber ventilated with filtered air.
This study is a preliminary report of the case series without a control group for comparison.
Results showed a significant improvement in the iron, iodine and vitamin A status of these children compared to a control group.
Table 4 shows the relative mortality of this group of patients compared with the control group.

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