control group

[ kuhn-trohl groop ]

Phonetic (Standard)IPA

noun

(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.

control group

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

First recorded in 1950–55

A control group—a population of gorillas unaffected by Ebola, separated by a river and 20 kilometers—was also observed.

The control group proved able to respond two to two and a half times faster than usual and with poor aim.

The researchers examined stories in 469 local papers following suicides in both the clustered and the control group.

In the Oregon study, 5.1 percent of the people in the control group had elevated GH levels.

For one thing, you'd probably have trouble getting people to stay in the control group once you put them there.

There is no control group, and consequently, no way of knowing whether the improvement was due to the removal of the defect.

As a control group, there were chosen 45 boys who had had no operation, and who lived and worked under the same conditions.

The average of the boys in the control group was 7421 and for the first group after operation 7406.

All members of this group were examined,—to the number of fifty-six, and from them the control group was finally selected.

The average improvement of the test group in excess of the control group is, then, 183 per cent.

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