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Discover Ludwig"controlled study" is a correct and usable phrase in written English.
You can use it when referring to an experiment or research method in which the same conditions are applied to a control group and a treatment group, and all other variables are kept constant. For example: "The researchers conducted a controlled study to compare the effects of the different types of diets on health outcomes."
Exact(53)
A dose controlled study.
A randomized double-blind controlled study.
Design: Randomized controlled study.
Design: Experimental, controlled study.
This was a very carefully controlled study.
Study design: Randomized controlled study.
Similar(7)
Design: Case-controlled study.
Design: Retrospective, cohort-controlled study.
Design: Prospective, placebo-controlled study.
A randomized sham-controlled study". PLoS ONE 12 (12): e0127012.
Design: Randomized, double-blind, placebo-controlled study.
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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