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Table 8 Example showing the two combinations when we have two hierarchical quasi-identifiers where we disclose all of their levels but assume that the adversary would only have background knowledge at the CMG_CODE and SHORT_CCI levels, and where one of the hierarchies is totally ordered

From: De-identifying a public use microdata file from the Canadian national discharge abstract database

Combination ID PROV_XXX AGE_GROUP GENDER_CODE MRDx CMG_CODE DIAG_BLOCK DIAG_CHAPTER CCI_CODE SHORT_CCI
2f X X X   X     X
2g X X X    X    X