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The phrase "a randomized 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 randomized controlled trial to evaluate the effectiveness of the new medication."
Alternatives: "a randomized trial" or "a controlled clinical trial".
Exact(59)
A randomized controlled trial.
A Randomized Controlled Trial.
A Randomized Controlled Trial [21k].
a randomized controlled trial in healthy participants.
Results from a randomized controlled trial.
Study design: A randomized controlled trial.
The researchers used the questions in a randomized controlled trial.
"Residential Demand Response - A Randomized Controlled Trial in California".
Muizelaar went on to conduct a randomized controlled trial, comparing hyperventilated patients with normally ventilated ones.
Design: The study design was a randomized controlled trial.
Similar(1)
The best form of an experiment is a randomized-controlled trial (RTC); an experiment.
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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