What percent is placebo?

[Vince]

AI Overview
The percentage of results that are placebo varies depending on the study type and condition being treated, but can range from 21% to 40%:
Placebo-controlled trials

• The average placebo response in placebo-controlled trials is 34%.
• Antidepressant clinical trials
  The mean placebo response rate in antidepressant clinical trials is 30% to 40%.
• Pain
  In one study, 44% of patients with pain experienced a psychological benefit from a placebo.
• Mental or emotional disorders
  In one study, 48% of patients with mental or emotional disorders experienced a psychological benefit from a placebo.
• Gastrointestinal disorders
  In one study, 40% of patients with gastrointestinal disorders experienced a psychological benefit from a placebo.
• Sexual dysfunction
  In one study, 50% of patients with sexual dysfunction experienced a psychological benefit from a placebo.

Placebos are commonly used in clinical practice, and it's estimated that about 40% of prescriptions are placebos.
The placebo response in clinical trials: more questions than answers - PMC

PubMed Central

The placebo response in clinical trials: more questions than answers - PMC

Meta-analyses and re-analyses of trial data have not been able to answer some of the essential questions that would allow prediction of placebo responses in clinical trials. We will confront these questions with current empirical evidence. The most ...

pmc.ncbi.nlm.nih.gov