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. 2006 Nov 21;8(4):e28. doi: 10.2196/jmir.8.4.e28

Table 2.

Percentage of time a quasi-identifier or combination of quasi-identifiers was considered “safe” more than 50% of the time (as sample sizes were varied from 30 to the maximum)

Safe Quasi-identifier or Combination Percentage of Time Quasi-Identifiers Were Below the Threshold
CPSO (%) LSUC (%)
gender 100 100
region 93 65
DOB – year 94 85
gender + region 85 82
gender + DOB – year 80