A randomized controlled trial is a form of scientific experiment used to control factors not under direct experimental control. Examples of RCTs are clinical trials that compare the effects of drugs, surgical techniques, medical devices, diagnostic procedures or other medical treatments.

What is a randomized controlled trial in research?

A randomized controlled trial (RCT) is an experimental form of impact evaluation in which the population receiving the programme or policy intervention is chosen at random from the eligible population, and a control group is also chosen at random from the same eligible population.

What is an example of a randomized control trial?

Example. Smoking reduction with oral nicotine inhalers: double blind, randomised clinical trial of efficacy and safety. ... INTERVENTION: Active or placebo inhaler as needed for up to 18 months, with participants encouraged to limit their smoking as much as possible.