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The Subject Elements dataset consolidates information about the timing of each subject’s progress through the epochs and elements of the trial. For elements that involve study treatmentsproduct exposure, the identification of which element the subject passed through (e.g., drug Tobacco Product X vs. placebo) is likely to derive from data in the Exposure domain or another Interventions domain. The dates of a subject’s transition from one element to the next will be taken from the Interventions domain(s) and from other relevant domains, according to the definitions (TESTRL values) in the Trial Elements (TE) dataset (see Section 7.2.2, Trial Elements).see Trial Design Description. 

The SE dataset is particularly useful for studies with multiple treatment periods, such as crossover studies. The SE dataset contains the date/times at which a subject moved from one element to another, so when this dataset, the Trial Arms (TA; see Section 7.2.1, Trial Arms) dataset, and the Trial Elements (TE;  see Section 7.2.2, Trial Elements) dataset are included in a submission, reviewers can relate all observations made about a subject to that subject’s progression through the trial.

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