The phrase "a special subgroup of" is correct and usable in written English.
You can use it when referring to a specific category or division within a larger group that has unique characteristics or features.
Example: "In our research, we focused on a special subgroup of participants who exhibited distinct behavioral patterns."
Alternatives: "a distinct subset of" or "a unique category of".
Of note, nine of the 21 lowland japonica landraces clustered together, suggesting a special subgroup of Kalimantan japonica landraces that have been adapted to irrigated conditions (Fig. 4).
In addition, it has to be mentioned that our sample provides a special subgroup of the general population and even of CAD patients.
A CDP subject is therefore a special subgroup of the CAP deaths.
"Forcing" GPs to change their professional doctrine and the perception of older patients as a special subgroup of people with limited cognitive abilities are current ethical issues.
For example, migrant women through marriage are a special subgroup of migrants who move to urban cities by marrying men with local residence.
Although information on a special subgroup of young people such as patients or military personnel [ 13, 14] is available, there are few studies targeting general young adults.
In particular, further work is needed regarding the BRICS member nations, a special subgroup composed of Brazil, Russia, India, China, and South Africa.
Thus, members of the MS Society could form a special subgroup (maybe older, with longer disease duration) and patients working on the questionnaire could be especially motivated.
As demonstrated in several sections of this study, old people compose a special subgroup among returnees.
Homicidal adolescents with psychopathy-like personality character form a special subgroup among other homicidal youngsters.
In order to discover special classes, we conducted a series of two-means clustering experiments of the positive observations, but they did not reveal the existence of any special subgroups of observations.
