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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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A further 932 were recruited from the public to act as a control group for comparison.
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.
Collection of the control group was essential for the evaluation of seropositivity among the general female population.
Results showed a significant improvement in the iron, iodine and vitamin A status of these children compared to a control group.
Researchers tested their SARS vaccine on four African green monkeys, with another four in the control group.

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