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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
Table 4 shows the relative mortality of this group of patients compared with the control group.
Collection of the control group was essential for the evaluation of seropositivity among the general female population.
Direct evaluation cannot be done because very few ganzfeld studies have included a control group.
A further 932 were recruited from the public to act as a control group for comparison.
The possibly calming effect of having family present for the control group during the intervention could have played a part in the reaction.
This study is a preliminary report of the case series without a control group for comparison.

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