- Experimental. An arm or group in which an experimental drug or regimen is being administered. Used when the trial specifies that one arm is a control arm and the other is experimental, or when the other arm is a placebo arm.
- Active Comparator. An arm or group in which active drugs are given. Includes arms that are mixing active drugs and placebos. Used when the term “control arm” is specified in the protocol and when another arm is designated as the experimental arm. There can be more than one active comparator arm.
- Placebo Comparator. An arm or group in which only a placebo is given.
- Sham Comparator. An arm or group in which only a mock therapy that is not a drug is administered
- No intervention. An observational arm or group
- Other. An arm or group which does not fall into any of the above categories.
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