The phrase "a primary study in" is correct and usable in written English.
It can be used when referring to a main or fundamental research study within a specific field or topic.
Example: "The researchers conducted a primary study in the effects of climate change on marine biodiversity."
Alternatives: "a key study in" or "a fundamental study in".
The incidence of adverse events was summarized in the all-treated patient population, which consisted of all patients who received at least one dose of DSG in a primary study or in the extension study.
This type of ancillary "freezer" study has informatics requirements most clearly different than a primary study and, in our experience, is the most common type of ancillary study.
Here, through the reanalysis of flow cytometry measurement data, we found that the differential composition of the leukocyte compartment at baseline was significantly associated with patients achieving a primary study endpoint in the RAVE trial.
Among meta-analyses in papers without a primary study, no differences in either general or genetic quality were found between the 3 types of journals.
However, in our review, all 31 meta-analyses which accompanied a primary study included that study in the meta-analysis.
A primary study estimated bird deaths in coastal waters within 25 miles of shore, which was assumed to be the farthest a carcass could drift before disappearing.
Also, one should be aware that subgroup analyses in a primary study can still suffer from ecologic bias.
If necessary, please draw a flow diagram for the primary study in the space provided on page 8 of the extraction form.
While a systematic review deeply analyzes a low number of primary studies, in a systematic mapping a wider number of studies are analyzed, but less detailed.
A comparison of included primary studies in reviews was undertaken as incorporating additional evidence can lead to different results [ 42].
