Question

What is a double blind test?

Accepted Answer

50% of patients are given the active drug and 50% are given a placebo (looks identical to active drug but is uneffective)
The patients and doctors don't know which group has taken the active drug until after the results have been observed
This prevents observer bias and reduces the placebo effect

Front	What is a double blind test?
Back	50% of patients are given the active drug and 50% are given a placebo (looks identical to active drug but is uneffective) The patients and doctors don't know which group has taken the active drug until after the results have been observed This prevents observer bias and reduces the placebo effect

Active Drug Patients Placebo Double Blind Test Identical