Table 2.
Sensitivity and specificity for social security number (SSN), full composite identifier, and abbreviated composite identifier
| Sensitivity | Specificity | |
| SSN | 86.5% | 99.6% |
| Full name+date of birth | 87.4% | 100% |
| Composite identifier | 97.2% | 99.98% |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.