A control group is the group that gets no treatment, kept for comparison. A randomised control group, compared with the control group, no control group at all.
Without one there is nothing to measure the treated group against, since people often improve anyway. The control group is usually given a placebo so that nobody knows which group they are in.
1nouncontrol groupThe group that gets no treatment, for comparison.
“The control group was given a placebo for the full twelve weeks.”
control group is a group.
Practised in Science & Space