The phrase "a primary study that" is correct and usable in written English.
It can be used when referring to a specific type of research or investigation that serves as the main source of data or findings in a particular context.
Example: "The researchers conducted a primary study that focused on the effects of sleep deprivation on cognitive performance."
Alternatives: "a main research study that" or "a fundamental study that".
This study presents the secondary analysis of a primary study that used a randomized control study design to demonstrate that a didactic educational intervention resulted in significantly more children being measured accurately within eight pediatric practices.
Posadzki et al. (2011) [ 9], however, included a primary study that evaluated the effectiveness of an intervention that was only part-Pilates [ 30].
The present study is a long-term follow-up to a primary study that has confirmed the non-inferiority of a two-dose schedule of the Adult formulation of this hepatitis B vaccine versus a three-dose schedule of the Paediatric formulation, when comparing the anti-HBs seroprotection rates and anti-HBs antibody GMCs at Month 7 [ 4].
The data were from a larger primary study that tested the effect of practitioner pain question phrasing on the amount of pain information described by older adults with osteoarthritis pain.
Meanwhile, Aladro-Gonzalvo et al. (2012) [ 10], Lim et al. (2011) [ 7] and Pereira et al. (2012) [ 8] incorporated an additional primary study that included participants with acute low back pain as well [ 28].
This was the primary study that Monsanto used to claim its GM soybeans were safe for human consumption.
In the literature there are only a few primary studies that studied these covariates at the person-level.
Evidence is presented in a table, and includes primary studies that are evaluated by authors.
Clinical decisions are ideally informed by a systematic review that finds, selects, and synthesizes the best primary studies that answer a single question[ 1].
To support a program of research in the field of rare inborn errors of metabolism (IEM), we conducted a broad scoping review of primary studies that: (i) focused on chronic pediatric diseases similar to IEM in etiology or manifestations and in complexity of management; (ii) reported patient- and/or family-oriented outcomes; and (iii) measured these outcomes using self-administered tools.
The next stage of the review thus involves an evidence search to identify primary studies that will provide empirical tests of each component of the theory.
