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GCSE Combined Science · key term
A trial in which neither the participants nor the staff conducting the trial know who receives the drug and who receives the placebo during testing.
Used by AQA and Edexcel
Specification 4.3.1.9 · Paper 1
Revise: Discovery and development of drugsIn a double-blind trial, neither the patients nor the staff conducting the trial know who receives the drug and who receives the placebo during testing.
Paper 1, Paper 2
A trial in which neither the participants nor the doctors assessing them know who receives the active drug and who receives the placebo during the trial.
Revise: Developing New MedicinesIn a double-blind trial, neither the patients nor the doctors assessing them know which treatment each patient receives during the trial. This reduces the influence of expectations on patients' reports and doctors' assessments, helping to reduce bias.
In a double-blind trial, neither the patients nor the staff conducting the trial know who receives the drug or placebo.
A placebo comparison and a double-blind trial are different features: the placebo provides a comparison, while double blinding reduces bias.
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