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Clinical Study Population Subgroup
Relatively uniform groups (e.g. etiologically and pathogenetically more homogeneous, racial, ethnic, or gender-specific, or the disease- or condition-specific) of study subjects formed within a clinical study population for a separate analysis. The selection of the subgroups, methods of subgroup analysis , and anticipated difference in observation outcome(s) have to be defined and justified in the study protocol and based on known biological mechanisms, and/or findings in previous studies. (NCI Thesaurus)
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A particular category of the relationship between two items of study-related documentation.
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