Table 4
Estimated EHR Use by Year
| Year of Adoption | (A) Number of Respondents Reporting an Adoption Year | (B) Estimated Number of Respondents Not Reporting an Adoption Year∗ | (C) Estimated Accumulated Total Number of EHR Adopters | (D) Estimated Accumulated Percentage of EHR Adoption† (%) |
| before 1990s | 4 | 1 | 5 | 1.0 |
| 1990–1999 | 36 | 7 | 48 | 8.5 |
| 2000 | 10 | 2 | 60 | 11.9 |
| 2001 | 18 | 3 | 81 | 16.0 |
| 2002 | 14 | 3 | 98 | 19.4 |
| 2003 | 17 | 3 | 118 | 23.3 |
| 2004 | 19 | 4 | 141 | 27.9 |
| 2005 | 19 | 4 | 164 | 32.4 |
| Total | 137 | 27 | — | — |
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EHR = electronic health record.
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↵∗ Numbers in column B were calculated using equation “27*A / 137” where 27 is the total number of EHR users who did not report an adoption year, “A” represents the number of respondents reporting an adoption year, and 137 is the total number of physicians who reported an adoption year.
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↵† Numbers in column D were calculated using numbers in column C divided by 506, the total number of included respondents in this study.
