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The phrase "a randomised controlled trial" is correct and usable in written English.
It is typically used in the context of research studies, particularly in the fields of medicine and social sciences, to describe a study design that randomly assigns participants to different groups to compare outcomes.
Example: "The researchers conducted a randomised controlled trial to evaluate the effectiveness of the new medication."
Alternatives: "a randomized clinical trial" or "a controlled clinical study".
Exact(60)
A randomised controlled trial.
The design was a randomised controlled trial.
A randomised controlled trial was conducted.
Electronic cigarettes for smoking cessation: a randomised controlled trial.
A protocol summary of a randomised controlled trial.
A randomised controlled trial study design was used.
Thomas, M. et al. Breathing exercises for asthma: a randomised controlled trial.
Maternal fish oil supplementation in pregnancy: a 12 year follow-up of a randomised controlled trial.
- Have the pills being sold in your name been subjected to a randomised controlled trial to test their efficacy?
It will be a randomised controlled trial, allocating the participants into two groups to compare their progress.
Elective ceasarean section at 38 weeks versus 39 weeks: neonatal and maternal outcomes in a randomised controlled trial.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com