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As stated previously, OCCDS is different from the ADaM Basic Data Structure ( BDS). There is no PARAM nor AVAL, for example. However, some of the variables described for BDS in ADaMIG v1.2 (available at https://www.cdisc.org/standards/foundational/adam) can be used in OCCDS, as shown below. Likewise, some variables defined below may be used in non-OCCDS ADaM dataset structures, such as TRTEMFL if needed. The more standardized variables commonly occurring in the ADaM OCCDS are described here in tabular format. In general, include all variables from the SDTM dataset and corresponding supplemental qualifiers that are needed for analysis or traceability. For traceability when copying variables from SUPPQUAL, it is recommended to use variable names that exactly match the corresponding SUPPQUAL.QNAM values. Additional study- or therapeutic-area-specific variables may be added as needed but should follow the standard variable-naming conventions described in ADaMIG v1.2 Section 3.3, ADaM Basic Data Structure (BDS) Variables. For example, variables with the 2-letter SDTM prefix are most commonly those that are copied from the SDTM or transposed SUPPQUAL dataset, or the numeric version of the SDTM variable, but not analysis versions of SDTM variables. Choose variable names with care to prevent unintended conflicts with standard names.

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• Any variable copied unchanged from ADSL
• Any variable copied unchanged from SDTM AE
  • SubClass ADVERSE EVENT should include all SDTM AE variables with the SDTM core value of Required or Expected.
• Any variable copied or derived from SDTM FA (see ADD LINK Section 9, Example 6: Analysis of Adverse Events that Change over Time)F
  • When FA is used as input to the ADVERSE EVENT SubClass dataset, a unique identifier variable, such as FASEQ or FASPID, is required for traceability.
• Any variable copied from content in SDTM SUPPAE
  • It is recommended to use SUPPAE QNAM as the ADVERSE EVENT SubClass dataset variable name, SUPPAE QLABEL as the ADVERSE EVENT SubClass dataset variable label, and SUPPAE QVAL as the ADVERSE EVENT SubClass variable content.
• Derived variables, such as numeric timing variables, TRTEMFL and other indicators, analysis versions of descriptive variables, and other variables derived using the naming conventions described in ADD LINK Section 32.9.27.11, User-specified Variable Naming Conventions