The phrase "a preliminary study of three" is correct and usable in written English.
It can be used when referring to an initial investigation or analysis involving three subjects, items, or cases.
Example: "The researchers conducted a preliminary study of three different teaching methods to assess their effectiveness."
Alternatives: "an initial study of three" or "a pilot study of three".
This spring, Neufeld completed a preliminary study of thirty children who had been placed on closely monitored regimens of Lovenox.
In a preliminary study of nine septic-shock patients who underwent a brain MRI because of an acute neurologic alteration, we found ischemic stroke and confluent or diffuse white matter lesions (which we called leukoencephalopathy) in two and five patients, respectively [ 7].
After a preliminary study of the material, four bituminous mixes were manufactured, which differed in their percentage of Silestone® waste aggregate.
A preliminary study of a shoal of ten flesh-and-blood sticklebacks shows that they do indeed mingle with the robot and that they follow its leadership cues as predicted.
In a recent preliminary study of seven patients treated for 3 months in an open-label design, the administration of HC via continuous infusion re-established the physiological circadian variation allowing reduction of the total GC dose and concomitantly improved subjective health status (30, 60).
A preliminary study for one of his frescoes inspired by the 1656 plague that struck Naples could not be more different from his usually conventional full-fledged paintings.
A preliminary study group of five patients were scanned on a GE high speed QXI multi-slice scanner with a slice spacing and thickness of 2.5 mm and the resulting DRRs used for daily treatment position verification.
Preliminary studies of two of the viruses showed that both replicated in donor ferrets and transmitted to direct-contact ferrets but only the shorebird H1N1 virus transmitted through the airborne route to ferrets in separate cages.
In 2002-3 a preliminary study conducted in four of the ten countries (China, Ghana, India and Mexico) started the process of identification of relevant conceptual domains and questions.
Both, TCBZ and its sulfoxide metabolite were used by Álvarez et al. [ 17] in a preliminary study testing two formulations of TCBZ in eggs from bile, one diluted with methanol and another one with DMSO.
