Table 2. Site Specific Positive Predictive Values (PPVs) and False Positive Proportions.
| Total number of errors | Total number selected for review | PPV in current EHR system | 95% Exact CIs | False positive proportion¥ | 95% Exact CIs | Expected PPV in an ideal EHR system* | 95% Exact CIs | ||
|---|---|---|---|---|---|---|---|---|---|
| n | n | % | n | % | % | ||||
|
| |||||||||
| Site A T1 | 95 | 454 | 20.9% | (17.3, 25.0) | 74 | 16.3% | (13.0, 20.0) | 25.0% | (20.7, 29.7) |
|
| |||||||||
| Site A T2 | 23 | 432 | 5.3% | (3.4, 7.9) | 50 | 11.6% | (8.7, 15.0) | 6.0% | (3.9, 8.9) |
|
| |||||||||
| Site A Control | 11 | 414 | 2.7% | (1.3, 4.7) | 7 | 1.7% | (0.70, 3.4) | 2.7% | (1.4, 4.8) |
|
| |||||||||
| Site B T1 | 46 | 220 | 20.9% | (15.7, 26.9) | 31 | 14.1% | (9.8, 19.4) | 24.3% | (18.4, 31.1) |
|
| |||||||||
| Site B T2 | 13 | 237 | 5.5% | (3.0, 9.2) | 14 | 5.9% | (3.3, 9.7) | 5.8% | (3.1, 9.8) |
|
| |||||||||
| Site B Control | 2 | 200 | 1.0% | (0.12, 3.6) | 13 | 6.5% | (3.5, 10.9) | 1.1% | (0.13, 3.8) |
|
| |||||||||
| Overall | 190 | 1957 | 189 | ||||||
*
Calculation: Numerator is the total number of errors and Denominator is the total number of selected for review minus the number of false positives
¥
Includes records where no documentation of clinical notes was found, patients left without being seen by the provider, patients saw a non-provider, or patients were advised admission for further work-up but refused
Abbreviations: EHR, electronic health record; T1, Trigger 1; T2, Trigger 2.