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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UpStudy AI · Accepted Answer

1. **Identify the groups:**  
   The study had three groups:  
   - Group receiving type A knee surgery  
   - Group receiving type B knee surgery  
   - Group receiving a simulated procedure (skin incision but no actual surgery)

2. **Examine the patient knowledge:**  
   The patients did not know which group they were assigned to. This means the study is at least single blind with respect to the patients.

3. **Examine the investigator’s knowledge:**  
   The problem does not mention that the investigators or clinicians were unaware of the group assignments. In double-blind studies, both participants and experimenters are unaware of the assignments. Since only the patients were blinded, the study was not double blind.

4. **Final Conclusion:**  
   The experiment was a **blind** experiment.

Thus, the correct answer is:  
$$ 	extbf{Blind.} $$
The experiment was **blind**.

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