arms of a trial, comparison group,
Treatment comparison groups are used in studies of treatment effects.
Outcomes measured in one group are compared to outcomes in another group.
Treatment comparison groups are sometimes categorised as treatment groups (intervention groups or experimental groups) and control groups.
However, control groups always receive some type of treatment, for example, usual care, a placebo, or active monitoring. In this glossary we have used “treatment comparison groups” and not distinguished between “treatment” groups and “control” groups.
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