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The identifier variables associated with the reference values are captured in the STRTMy (Stratum y) variables. The actual values of the STRTMy variables are captured in the  STRVALy (Stratum y Value) variables. As many identifiers as necessary based on the source data should be captured in the reference dataset. The order of the stratum variables has no inherent meaning, so ordering is not defined in this section. The convention of y is used as an index value indicating an integer with a value of 1-99 (as described in the ADaM standard section). There is no requirement that the stratum variables start with 1, nor must the variables use consecutive values. Some examples of stratum variables are Year, Sex, Race, Age, Transition type, and Product.

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