The phrase "a certain subgroup of" is correct and usable in written English.
It can be used when referring to a specific but not precisely defined group within a larger category.
Example: "In our research, we focused on a certain subgroup of participants who exhibited unique behavioral patterns."
Alternatives: "a specific subset of" or "a particular group of".
He said he knew that H.I.V. caused AIDS, but wanted to explore why a certain subgroup of the virus is more prevalent in Africa than in the West, and whether poverty and malnutrition are likely causes.
"Psychedelics are one of the vectors that a certain subgroup of people experiment with… to try to achieve more of a sense of wholeness".
"Our purpose was not only to entertain the readership with a quite comical case report on complications of headbanging that confirms the reputation of Motörhead as undoubtedly one of the hardest rock 'n' roll bands on Earth, but to sensitize the medical world for a certain subgroup of fans that may be endangered when indulging themselves in excessive headbanging," he said.
Is there a certain subgroup of LBP suffering from movement control dysfunction?
Most of these studies are retrospective or limited to a certain subgroup of patients [ 10- 15].
Extent of impact is not a designated number or percentage, but rather varies according to how many rightsholders exist and are affected within a certain subgroup of rightsholders.
The center is shown to be isomorphic to C(G/G0ρ) for a certain subgroup G0ρ of G, and there is a 1 1 correspondence between normalised traces and probability measures on G/G0ρ.
For some surveys, it is important to ensure that there are enough members of a certain subgroup in the population so that more reliable estimates can be reported for that group.
An often used quantitative approach to investigate the association between a certain subgroup characteristic and the size of the treatment effect is by applying meta-regression analysis [ 11].
The additional vertical axis in the modified forest plot indicates the proportion of a certain subgroup variable in the included studies.
A modification of the forest plot, by including an additional (vertical) axis indicating the proportion of a certain subgroup variable, is a qualitative, visual, and easy-to-interpret method to explore potential subgroup effects in studies included in meta-analyses.
