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An open-label study is a trial that is not “blinded” (meaning the patient is not told which arm of the trial he or she is on); both the doctors and patients know what treatment is being given. Note that an open-label study can be randomized or nonrandomized, as long as the patients and doctors know what treatment has been assigned.

Steven C.Quay
10.4135/9781412950602.n555
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