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• Comparison of the --DTC of a finding observation to the element transition dates (values of SESTDTC and SEENDTC) identifies which element the subject was in at the time of the finding. Similarly, one can determine the element during which an event or intervention started or ended.
• “Day within Element” or “Day within Epoch” can be derived. Such variables relate an observation to the start of an element or epoch in the same way that study day (--DY) variables relate it to the reference start date (RFSTDTC) for the study as a whole. 
• Having knowledge of SE start and end dates can be helpful in the determination of baseline values.