n.

a distinct and often subordinate group within a group

(mathematics) a subset (that is not empty) of a mathematical group

Free subgroups in linear groups
Dyspepsia and dyspepsia subgroups: a population-based study.
Genomics identifies medulloblastoma subgroups that are enriched for specific genetic alterations.
Differing circadian patterns of symptom onset in subgroups of patients with acute myocardial infarction.
Analysis and Interpretation of Treatment Effects in Subgroups of Patients in Randomized Clinical Trials
A gene expression-based method to diagnose clinically distinct subgroups of diffuse large B cell lymphoma.
Diffuse large B-cell lymphoma subgroups have distinct genetic profiles that influence tumor biology and improve gene-expression-base...
The Study on COgnition and Prognosis in the Elderly (SCOPE) - major CV events and stroke in subgroups of patients.
Marker antibody expression stratifies Crohn's disease into immunologically homogeneous subgroups with distinct clinical characterist...
Surgical revascularization is associated with improved long-term outcomes compared with percutaneous stenting in most subgroups of p...