The phrase "a previous study indicated" is correct and usable in written English.
You can use it when referencing findings or conclusions from an earlier research study in your writing.
Example: "A previous study indicated that regular exercise can significantly improve mental health."
Alternatives: "an earlier study suggested" or "a prior study showed".
A previous study indicated that increased litter abundance results from summer warming in the Arctic, reflecting the increased abundance of evergreen trees and low-growing and tall shrubs40.
Results from a previous study indicated that the scale invariant for the preparation of HIPRE could be the stirring rate.
A previous study indicated that CBD attenuates the imbalance between Bcl-2/Bax, upregulating the anti-apoptotic protein Bcl-2, which in turn maintains the integrity of the outer mitochondrial membrane, in an animal model of multiple sclerosis46.
A previous study indicated that the DEC was a powerful identifier of submaximal effort of shoulder external rotation in normal volunteers.
However, a previous study indicated that the maximum biting force (400 N) was better for occlusal adjustment with intercuspal clenching.
A previous study indicated that in some African countries significant portion of protein is obtained from wild meat.
A previous study indicated that phosphorylation of residue Y105 inhibits FBP association and tetramer formation of PKM2, and thus decreases its enzymatic activity (Hitosugi et al., 2009).
A previous study indicated that a primary treatment process has limited capability to remove and/or degrade antidepressants residues in wastewater [15].
A previous study indicated that recombinant LenA (Lsa24) bound laminin [2].
In the sclera, a previous study indicated that TG activity was localized to mainly to the episcleral vessel walls [18].
A previous study indicated that regional volumes are positively correlated to their mutual information, which measures the functional connectivity between the region and the remaining brain regions [84].
