Table 4.

Sensitivity per linkage variable

Sensitivity	Linkage variable
86.5%	Social security number (overall)
87.4%	First+last name+date of birth
93.1%	First name
94.5%	Social security number (when present)
95.2%	Last name
96.7%–97.2%	Hash consisting of first two letters of first and last names+date of birth
99.7%	Date of birth