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SDTM variables can be classified into 5 major roles:

• Identifier variables, 

  Jira
  showSummary false server Issue Tracker (JIRA) serverId 85506ce4-3cb3-3d91-85ee-f633aaaf4a45 key SDTM-793

  such as those that identify the study, the subject involved in the study, the domain, and the sequence number of the record;
• Topic variables, which specify the focus of the observation (e.g., the name of a lab test);
• Timing variables, which describe the timing of an observation (e.g., start date, end date);
• Qualifier variables,

  Jira
  showSummary false server Issue Tracker (JIRA) serverId 85506ce4-3cb3-3d91-85ee-f633aaaf4a45 key SDTM-794

  which include additional illustrative text or numeric values that describe the results or additional traits of the observation (e.g., units, descriptive adjectives); and
• Rule variables, which describe the conditions for starting, ending, branching, or looping in the Trial Design model.

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