A treatment study in which no control group is used and,typically,few participant exclusion criteria are applied is known as a(n)

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An open trial is a treatment study where no control group is used, and few participant exclusion criteria are applied. It is also known as an uncontrolled trial or unblinded trial. In such a study, all participants receive the treatment under investigation, and the results are observed and recorded. However, since there is no control group to which the treatment group can be compared, it is difficult to draw definitive conclusions about the effectiveness of the treatment.

A Treatment Study in Which No Control Group Is Used