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J Am Med Inform Assoc 16:256-266 doi:10.1197/jamia.M2902
  • Original Investigation

Evaluating Predictors of Geographic Area Population Size Cut-offs to Manage Re-identification Risk

Table 8

The Percentage of FSAs and the Provincial Populations That Would be Above the GAPS Cut-off for an Age × Gender Quasi-identifier Combination for All Ten Canadian Provinces When the Age Variable is Coarsened to Different Sized Intervals

Original Variables 2-yrs Age Intervals 5-yrs Age Intervals 10-yrs Age Intervals
Province FSA Pop FSA Pop FSA Pop FSA Pop
Alberta 55% 84% 68% 92% 79% 96% 84% 98%
British Columbia 68% 87% 78% 93% 90% 99% 93% 99%
Manitoba 59% 88% 66% 92% 72% 95% 78% 98%
New Brunswick 20% 51% 26% 59% 37% 70% 45% 75%
Newfoundland 55% 83% 70% 91% 79% 95% 88% 98%
Nova Scotia 47% 82% 54% 86% 66% 93% 72% 95%
Ontario 69% 91% 78% 96% 84% 98% 87% 99%
PEI 57% 90% 71% 97% 71% 97% 71% 97%
Quebec 59% 84% 70% 91% 82% 96% 88% 99%
Saskatchewan 60% 93% 69% 97% 69% 97% 71% 98%
  • FSA = forward station area; GAPS = geographical area population size; PEI = Prince Edward Island.

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