TABLE 3—
Matches of Respondents in the American Community Survey (ACS) With Protected Identification Keys (PIKs) to Patients Having Electronic Health Records (EHRs) With PIKs: United States
| No. of Matches | Total No. of ACS Observations With PIKs (Varies by ACS Year) | Match Rates of All ACS Observations With PIKs | |
| Overall, all ACS years | 29 000 | 57 160 000 | 0.05074 |
| 2001 | 450 | 1 038 000 | 0.04335 |
| 2002 | 400 | 890 000 | 0.04494 |
| 2003 | 500 | 1 015 000 | 0.04926 |
| 2004 | 450 | 1 019 000 | 0.04416 |
| 2005 | 1 700 | 3 323 000 | 0.05116 |
| 2006 | 1 900 | 3 492 000 | 0.05441 |
| 2007 | 1 700 | 3 440 000 | 0.04942 |
| 2008 | 1 800 | 3 589 000 | 0.05015 |
| 2009 | 1 800 | 3 567 000 | 0.05046 |
| 2010 | 1 900 | 3 729 000 | 0.05095 |
| 2011 | 1 900 | 4 045 000 | 0.04697 |
| 2012 | 2 300 | 4 528 000 | 0.05080 |
| 2013 | 2 400 | 4 612 000 | 0.05204 |
| 2014 | 2 500 | 4 870 000 | 0.05133 |
| 2015 | 2 500 | 4 856 000 | 0.05148 |
| 2016 | 2 400 | 4 670 000 | 0.05139 |
| 2017 | 2 300 | 4 502 000 | 0.05109 |
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); EHRs from a health care system in the southeastern United States (2016–2019).