The term "placebo group" refers to a control or comparison group in clinical research, where participants receive an inactive treatment or fake intervention that is designed to resemble the real treatment as closely as possible. Full definition
Overall, the gene therapy was well tolerated and patients in the treatment and placebo groups experienced similar rates of adverse events. (sciencedaily.com)
Patients were randomly assigned to either the vitamin D group or the matching placebo group, and received supplementation every three months for one year. (sciencedaily.com)
In 2015, supporting all of this evidence, a wide - ranging study was published that included data from 79 trials (6,462 participants), which «reported improvements to symptoms compared with patients in placebo groups.» (ahealthblog.com)