"Specific subgroups" refers to smaller, distinct groups within a larger group. It means focusing on particular categories or divisions within a broader set of people or objects. Full definition
Borodovsky and colleagues examined associations between provisions of legal cannabis laws (such as allowing dispensaries, home cultivation, etc.) and cannabis consumption patterns among youth using online surveys distributed through Facebook, which proved to be a reliable method for generating geographically diverse samples of specific subgroups of cannabis - using youth. (sciencedaily.com)
In this section, each school district must list its annual goals for all students as well as for specific subgroups of students (including racial / ethnic subgroups, the three target subgroups — English learners, low income students, and foster youth — and students with disabilities). (healthhappenshere.com)
FDA doesn't have specific information on the consumption of food coloring for specific subgroups in the U.S., which includes kids (ahealthblog.com)