*The Class column in each variable table indicates if the variable is required, expected, or permissible.
R = Required either for analysis or per CDISC, the variable must be mapped in order to continue.
C = Conditionally required, i.e., mapping is required if a particular condition is met.
E = Expected indicates an optional but empty column that needs to be created for CDISC domains.
P = Permissible is an optional variable that does not require the creation of a column for CDISC.
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