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Many times, a modified version of an SDTM variable is needed, such as when missing data is imputed. As shown in ADD LINK Section 3.2.8, Descriptive Variables, when creating an analysis version of an SDTM descriptive variable, the prefix “A” (for Analysis) replaces the 2-letter SDTM domain code. This same convention can be used to create analysis versions of variables not specified in Section 3.2.8. For example, if changes needed to be made to AEBODSYS for analysis, the variable name ABODSYS (with a prefix of “A” instead of “AE”) would convey that it is the analysis version of the AEBODSYS variable, and that the value of ABODSYS may not be the same as AEBODSYS on some records.

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