The phrase "a previous study conducted" is correct and usable in written English.
It can be used when referring to a study that was carried out before the current discussion or research.
Example: "According to a previous study conducted by Smith et al., the results indicate a significant correlation between the variables."
Alternatives: "an earlier study performed" or "a prior study carried out".
A previous study conducted by his students on gypsy moths affected the town's decision not to spray the area.
Comparison is made with the results of a previous study conducted when SA was turned on.
This study represents an update to a previous study conducted by the authors in 2011.
In a previous study conducted in our laboratory10, we were able to fabricate soft tissue prostheses using a D3DP; the prostheses, which showed smooth surfaces and intricate structures, cost only about $30.
In a previous study conducted in the same geographic region with the same coating procedure29, the presence of the bacteria was attested on the plant roots, and its tightly adhering soil, after seed germination.
In a previous study conducted at a combat support hospital in Iraq, we reported the major lifesaving benefits of emergency tourniquets to stop bleeding in major limb trauma.
Still, routine and first-flush water quality under intermittent supply was much better in Arraiján than that reported in a previous study conducted in India.
A previous study conducted by Dr. Bao and colleagues found that the launch of a drug monitoring program in a state was associated with reduction in Schedule II opioids prescribed to patients seeking pain relief.
(A previous study conducted at New York University found similar results among adults).
A decrement due to each health state was applied based on a previous study conducted in Thailand [15] (Table 3).
A previous study conducted in our teaching hospital in The Netherlands showed poor documented adherence to diagnostic protocol [7].
