The phrase "a recent study of three" is correct and usable in written English.
It can be used when referring to a study that involved three participants, subjects, or cases, typically in academic or research contexts.
Example: "According to a recent study of three individuals, the results indicate a significant correlation between the variables."
Alternatives: "a recent study involving three" or "a recent study with three participants".
A recent study of three Chinatowns in Boston, New York City and Philadelphia starkly maps out gentrification's effects in crowding out once tight-knit ethnic communities.
A recent study of three Romano-Egyptian panels dating from 180-200 CE in the J. Paul Getty Museum showed that the panels contained proteinaceous paint media.
A recent study of three PNs by Bernard-Salas et al. (2012) does not favor the thermal model because (1) the excitation classes of these PNs are very different while the C60 flux ratios are fairly similar, and (2) C60 is located in a region far from the central star and would be difficult to be heated to the deduced thermal temperatures.
Notably, though, a recent study of three districts in Karnataka state (Mysore, Belgaum and Bellary) found that condom use at last sex with non-commercial (non-marital) partners of FSWs has increased significantly (24.4% to 55.9%) over six years of the intervention [ 53], although this was not the case earlier in the intervention [ 12].
Its presence in the premotor phase of the disease has been supported by a recent study of three patients who were found to have αsyn staining in bowel biopsy samples obtained 2-5 years before they presented with signs of PD; such staining was not seen in 23 healthy controls [ 16].
A recent study of three thousand New England high-school kids shows that students with B averages or better enjoyed seventeen to thirty-three moretesleepe sleep and went to bed ten to fifty minutes earlier than students with C averages.
But a recent study of eleven commodities markets found that when speculators made up forty per cent or more of the market, prices were roughly half as volatile as they were in markets where speculative trading was less prevalent.
A recent study of forty-one Pacific islands found that, between initial human colonization and European contact, two-thirds of the populations of large land birds were driven extinct by hunting and deforestation.
Flood-resistant rice "differentially benefits [India's] scheduled castes and tribes", a recent study of one of the early field trials concludes.
A recent study of two villages in central Bihar, Bhokhila and Kaithi, suggests that even there the lot of the poor has improved.The study's authors found the traditionally stratified social structure still in place, but not intact.
A recent study of five extraction model fits and three IDIF estimation methods demonstrated that these choices substantially influence MBF estimates [20].
