The phrase "a previous study concerned" is correct and usable in written English.
It can be used when referring to a study that focused on a specific topic or issue in the past.
Example: "A previous study concerned the effects of climate change on marine biodiversity."
Alternatives: "an earlier study focused" or "a prior study addressed".
This patient cohort was subject of a previous study, concerning the percentage of appropriate visits of self-referred patients in the ED [4].
Triggering performances depicted within our study are similar to those observed in a previous study concerning emergency transport ventilators [8] and tended to be higher than previously observed [9, 17].
In a previous study concerning the analysis of the secretome of T. reesei CL847 growing on lactose-based media, 22 biomass-degrading enzymes were identified and represented 93%% of the secretome (Herpoel-Gimbert et al. 2008).
A previous study concerning Orthoptera mitogenomes suggested that the cox1 gene may start with an irregular tetranucleotide codon AUGA [ 4].
These figures are comparable to a previous study concerning an emergency contraception website (Wynn & Trussell, 2005) that found peaking e-mails on Monday.
A previous study concerning interpreting practices in an elderly healthcare context is limited to investigating communication through professional interpreters on the spot [ 14].
In a previous study concerning POPs and male reproduction, a threshold-like effect was noted when categorizing CB-153 serum levels into equally sized quintiles [ 8].
These results are comparable to a previous study concerning C-arm CT which reported a detection rate of supplementary lesions of 15%% [ 8].
This paper describes posterior analyses on data from a previous study concerning the associations between depression and appraisal of insulin therapy [ 17].
In a previous study concerning the implementation of the Housing First program in an American suburban county, Felton [ 6] found that this program was also described as a new practice having unique expertise, and this again met resistance from local authorities.
