A clinical study was conducted on the effectiveness of a new knee surgery to cure a specific type of arthritis. Of the 219 individuals who met the inclusion criteria, 114 declined to participate. The researchers randomly divided the remaining 105 subject into three groups: One group received type A knee surgery; and the second group received type B knee surgery; a third group received skin incision to make it look like they had received knee surgery, but no actual surgery was performed. The patients in the study did not know which group they were in and in particular did not know if they were receiving the real surgery or simulated surgery. In a two-year follow up, all three groups said they had slightly less pain and better knee movement, but the "fake" surgery group often reported the best results. Was the experiment blind, double blind, or neither. Blind. Double Blind. Neither.
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The experiment was double blind! In a double-blind study, neither the participants nor the researchers know who is receiving the actual intervention versus a placebo, which helps eliminate bias. Here, the patients didn’t know whether they received the real surgery or the simulated procedure, and ideally, the researchersassessing the outcomes should also be unaware of the group assignments to further enhance objectivity. However, let's not overlook that while the patients were kept in the dark, it's important to ensure that the people administering treatments also do not know which group is which. If they do, that could introduce bias in how they assess results. Stay vigilant in experimental designs, as they significantly affect the outcomes and interpretations!
