Noun
control group (plural control groups)
(in an 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.
Among about 11,000 cases of heart attacks, 84 people had a respiratory infection the week before (0.8 per cent) and in the controls, compared with 34 of the 11,000 people in the control group (0.3 per cent). Source: Internet
And given that time has to elapse before rheumatic diseases leave traces in the bone, they selected the remains of another 43 adults in the over the age of 45 as a control group and analyzed the mitochondrial lineages. Source: Internet
A study found that after seven weeks the group treated with yoga reported significantly less mood disturbance and reduced stress compared to the control group. Source: Internet
A study citation from 2001, which included 436 cases (never smokers who had lung cancer), and a control group (1649 never smokers) showed that exposure to radon increased the risk of lung cancer in never smokers. Source: Internet
In a true experiment, researchers can have an experimental group, which is where their intervention testing the hypothesis is implemented, and a control group, which has all the same element as the experimental group, without the interventional element. Source: Internet
A control group of 87 patients with diabetes received the American Diabetes Association standard nutritional treatment. Source: Internet