The phrase "an old study" is correct and usable in written English.
It can be used when referring to a research study or academic paper that was conducted or published a long time ago.
Example: "According to an old study, the effects of sleep on cognitive function were not well understood."
Alternatives: "a previous study" or "an earlier research".
We've all fallen prey to "stimulating" and "intelligence enhancing" toys because of an old study showing that rats in "enriched" environments turn out smarter than those in impoverished ones.
We could not rule out that IL-6 acts as an intracrine growth factor in the cells we selected, since an old study showed that an anti-IL-6 antibody did not inhibit U266 and RPMI8226 cell growth [43].
The current policy to reject the tapering regimen is based on an old study in patients with an asthma exacerbation [ 16].
41 From a societal perspective, an old study concluded that the economic benefits of selegiline therapy are likely to be substantial.
In addition, in contrast with animals, coproporphyrins (mainly CPIII) were lower in subjects with higher levels of HCB which agrees with an old study in workers from a chlorinated solvents plant [ 8].
In addition, frailty in older persons is very common and is associated with immobility, poor food intake, and dehydration [ 15]: an old study reported that constipation is present in 45 % of frail elderly persons [ 16].
While Palmatier says there has been a lot of research on the psychology of gratitude in the past five or six years, he points to an older study that's now considered a classic.
Mr. Sabban, however, cited an older study by Charles River, a consulting firm, which found that the losses in revenue for Saudi Arabia alone would be $19 billion a year starting in 2012.
The comparison of PubChem to an older study of known chemical structures shows noticeable differences.
According to an older study, aluminum is also not essential for any higher plants [5].1 The main source of aluminum in the human body is food.
In another nonrandomized study, the study subjects who received additional bicarbonate therapy for DKA [23] were compared with controls from an older study, which used the usual treatment with insulin and saline [39].
