Blinding to treatment involves not letting the patient know which intervention is being delivered
If the research subject who exercises daily because he is in the treatment group knows which treatment is being delivered, but the researcher and the research staff do not know, what type of condition exists?
a. Single blinding
b. Double blinding
c. Triple blinding
d. Unilateral unblinding
ANS: A
With single-blinded studies, there are two variations. In one variation, study participants are not aware of their treatment assignment but investigators and research staff may have knowledge of who is in what group. The reverse may be used when participants have knowledge of their treatment group assignment but this information is not available to the investigators and research staff. For example, children involved in research comparing the calming effects of music alone compared to music with mother's voice delivered by audiotaped recordings would recognize the contents of the tape if they were alert. Researchers and data collectors may not be told of participant group assignment. Double-blinded studies keep knowledge of study conditions from study participants, investigators, and research staff. When a study is triple-blinded, the participants, researchers, and those involved in data management are unaware of group assignment.
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