Stratum Group

**Semantic type:** Group

**Definition:** A designation used to segregate study subjects into collections in order to balance the study for analysis. The stratum group is made up of a combination of stratification criterion answers, which ultimately is used to assign study subjects to arms on a study. IMPORTANT NOTICE: The NCI Thesaurus contains biomedical terminologies that NCI does not own or control. This concept contains gender-related content that does not comply with Executive Order 14168.

**Synonyms:** - StratumGroup - StratumGroup