A support for the elbow, at the side of a chair, the end of a sofa, etc.

in clinical trials, one group of participants (an iarmi of the trial) receives one treatment (drug) while another arm receives a different treatment (placebo).

The anatomical region between the shoulder and the elbow. Sometimes called the upper arm.

In a trial, a group of participants in a clinical trial who receive the same treatment, intervention, or placebo. Other arms receive different treatments.

A treatment or test group in a randomized clinical trial. Trials with more than one treatment are said to have multiple arms.

Any of the treatment groups in a randomized trial. Most randomized trials have two "arms," but some have three "arms," or even more.

A group of participants in a comparative clinical trial all of whom receive the same treatment, intervention or placebo. The other arm(s) receive(s) a different treatment. Most randomized trials have two "arms," which may be comparing either a new drug with a placebo, or comparing two drugs to each other. Some trials have three "arms," or even more. [ See Randomized Trial].

a group of participants in a research trial who receive the same treatment (treatment arm) or placebo (control arm).

The treatment or intervention groups in a clinical trial are referred to as trial or study arms.

One of the intervention groups in a clinical trial. A clinical trial comparing two doses of a new medication with a placebo would have three arms (dose 1, dose 2, and placebo).

One of the treatment groups of a randomized trial. The majority of randomized trials have 2 ., but some may have more.

In popular usage, the appendage that extends from the shoulder to the hand. However, the medical definition refers to the upper extremity extending from the shoulder only to the elbow, excluding the forearm, which extends from the elbow to the wrist. The arm contains one bone: the humerus. In a randomized clinical trial, any of the treatment groups. Most randomized trials have two "arms," but some have three "arms," or even more.