The phrase "a previous study proved" is correct and usable in written English.
You can use it when referencing findings or conclusions from an earlier research study to support your current argument or statement.
Example: "A previous study proved that regular exercise significantly improves mental health."
Alternatives: "an earlier study demonstrated" or "a prior study established".
A previous study proved that segmental bovine growth plate grafting has potential osteoinductive properties [30].
A previous study proved the non-inferiority of a unique dose of treatment using Algopirin®, versus Excedrin® similar association.
A previous study proved that genes captured by Helitrons reshuffled the transcriptome of maize.
A previous study proved that ethanol induced gastric tissue injury by increasing reactive species formation [ 37].
A previous study proved that Plexin-B1 regulates the actin cytoskeleton by activating Rho activity [ 22].
The upregulation of the expression of the Golgi GDP-mannose transporter (F481_08390) under experimental group IV conditions, bearing in mind that a previous study proved that this transporter participates in glycosylation [ 76], indicated that the sugar metabolic pathway is active in E. pusillum after obtaining carbohydrates.
Previous study proved that haem may be a relevant iron source for Brucella during intracellular replication.
Previous study proved that the intra-species differences of some genes caused different bacterial adaptation to the environment [ 20, 21].
Previous study proved that transmission of infection from mother to infant was not detected on delivery [ 28].
Previous study proved that miR-21 could direct regulate PTEN tumor suppressor gene mRNA translation at post-transcriptional level in hepatocellular carcinoma and GBM cells [ 25].
Our previous study proved that distinct differences exist in the pattern of genomic imbalances in the ABC and GCB subtypes, as classified by gene expression profiling.
