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The phrase "a previous study showed" is correct and usable in written English.
It can be used when referencing findings or conclusions from an earlier research study in academic or scientific writing.
Example: "A previous study showed that regular exercise can significantly improve mental health."
Alternatives: "an earlier study indicated" or "a prior study demonstrated".
Exact(60)
In Pakistan, on the other hand, a previous study showed a survival rate of 18% [6].
A previous study showed that this filtration step did not cause analyte losses [39].
A previous study showed that this new drospirenone-only pill effectively inhibited ovulation.
A previous study showed that high doses of methamphetamine induce self-injurious behavior (SIB) in rodents.
A previous study showed reduction of post-ERCP pancreatitis with administration of rectal diclofenac.
However, a previous study showed that small birds are the most favorable animals among urban Malaysians (Nik Mohamad 2011).
A previous study showed that reinforcing the neck region is necessary in reduced-diameter Straumann® tissue level implants [25].
A previous study showed that nanosilver-coated orthodontic brackets prevent caries formation via its antibacterial properties [16].
A previous study showed that a low hematocrit resulted in a decrease in pulmonary vascular resistance [8].
A previous study showed that with lateral incision, postoperative range of motion was better than posterior incision.
A previous study showed that endocytosis played a role in symbiosis between legumes and rhizobia (Wang et al. 2015).
More suggestions(15)
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a kinetic study showed
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a previous study obtained
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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