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TSVALNF contains a “null flavor,” a value that provides additional coded information when TSVAL is null. For example, for TSPARM = "AGEMAX" (Planned Maximum Age of Subjects), there is no value if a study does not specify a maximum age. In this case, the appropriate null flavor is "PINF", which stands for "positive infinity." In a tobacco study conducted in healthy volunteers where the trial phase classification is not established, the null flavor for TSPARM = "TPHASE" would be "NA" (i.e., not applicable).

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