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Timing Variables
Timing variables (e.g., dates) are included in CDASH; they are used to indicate when a particular observation occurred or a period of time when something happened.
The timing variables included in CDASH Model Section 2.7, Timing (https://www.cdisc.org/standards/foundational/cdash) are available for use in any CRF based on 1 of the 3 general observation classes, except where specific domain restrictions are noted in the SDTMIG. In general, all domains based on the 3 general observation classes should have at least 1 timing variable. In the Events or Interventions general observation class, this could be the start date of the event or intervention. In Findings domains, the collected timing variables generally refer to the date of the test result itself. However, in Findings domains where the result is based on a specimen—such as Laboratory Test Results (LB), Microbiology Susceptibility (MS), Microbiology Specimen (MB), Microscopic Findings (MI), or Pharmacokinetics Concentrations (PC) (Sampling)—the date of the specimen collection associated with the test result is used.
The CDASH Model defines Death Date (DTHDAT) as a timing variable; this is not included as a timing variable in the SDTMIG. It was included as a timing variable in CDASH, as it may be collected on any CRF deemed appropriate by the sponsor, but should only be collected once.
Visits
Protocols define visits in order to describe assessments and procedures that are to be performed. Visits are typically described using the timing variables VISIT and VISITNUM. The date of the visit is typically collected in the CDASH timing variable VISDAT, which is the date the visit occurred (or started).
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CDASH Model v1.2 provides a general framework for creating fields to collect information on CRFs and includes the model metadata, which shows the standard variables in the model.
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