The phrase "a study has confirmed" is correct and usable in written English.
You can use it when referring to research findings that validate a particular hypothesis or claim.
Example: "According to recent research, a study has confirmed that regular exercise improves mental health."
Alternatives: "research has validated" or "findings have substantiated".
A study has confirmed that alcohol can cause cancers by permanently damaging stem cell DNA.
A study has confirmed the feasibility of designing, fabricating and installing resonant magnetic field perturbation (RMP) coils in JET1 with the objective of controlling edge localized modes (ELM).
It is only now that a study has confirmed that the emergence of such a deadly virus is theoretically possible.
Now, a study has confirmed this and pointed to an easy solution: Banning the use of a drug called avoparcin on farms dramatically cut microbe's resistance to a related drug, vancomycin, in Belgian hospital patients.
A study has confirmed that spliceosome participated in this process (Ashwal-Fluss et al., 2014), in which proteins recognize sequence elements in flanking introns or exons, recruit other proteins, such as U1 snRNP, hnRNP proteins, and SR proteins, thus change RNA conformation and cause to-be-joined exons to approach each other (Kramer, 1996).
Well, a study has confirmed that there is a significant increase in open-rate of emails that don't posses a subject line - most likely because the email client is then displaying the direct contents of the email: Hello Name, blah blah.
A recent study has confirmed that even a little exercise — just 8 to 15 minutes a day — reduced the risk of death.
Consistent with these past results, a recent study has confirmed postprandial hyperglycemia as an independent risk factor for cardiovascular disease in type 2 diabetes (3).
A recent study has confirmed that exercise stress testing can be a useful method of risk stratification.
A SAR study has confirmed the importance of the 1,2,4-trioxane unit as a pharmacophore for anticancer activity.
A new study has confirmed what many already suspected: the careers of Australia's female authors are suffering due to gender bias within the literature industry.
