TABLE 2—
Matches of Patients Having Electronic Health Records (EHRs) With Protected Identification Keys (PIKs) to Respondents in the American Community Survey (ACS) : United States
| No. of Matches | Total No. of EHRs With PIKs (Constant Over Time) | Match Rates of EHRs With PIKs | |
| Overall, all ACS years | 29 000 | 187 000 | 15.508 |
| 2001 | 450 | 187 000 | 0.241 |
| 2002 | 400 | 187 000 | 0.214 |
| 2003 | 500 | 187 000 | 0.267 |
| 2004 | 450 | 187 000 | 0.241 |
| 2005 | 1 700 | 187 000 | 0.909 |
| 2006 | 1 900 | 187 000 | 1.016 |
| 2007 | 1 700 | 187 000 | 0.909 |
| 2008 | 1 800 | 187 000 | 0.963 |
| 2009 | 1 800 | 187 000 | 0.963 |
| 2010 | 1 900 | 187 000 | 1.016 |
| 2011 | 1 900 | 187 000 | 1.016 |
| 2012 | 2 300 | 187 000 | 1.230 |
| 2013 | 2 400 | 187 000 | 1.283 |
| 2014 | 2 500 | 187 000 | 1.337 |
| 2015 | 2 500 | 187 000 | 1.337 |
| 2016 | 2 400 | 187 000 | 1.283 |
| 2017 | 2 300 | 187 000 | 1.230 |
Note. The US Census Bureau reviewed this data product for unauthorized disclosure of confidential information and approved the disclosure avoidance practices applied to this release, CBDRB-FY21-POP001-0087. All numbers are rounded according to US Census Bureau disclosure protocols.
Source. ACS data (2001–2017) and EHRs from a health care system in the southeastern United States (2016–2019).