Site-specific positive predictive values (PPVs) and false positive proportions
| Total number of errors | Total number selected for review | PPV of diagnostic errors in current EHR system | 95% Exact CIs | False positive proportion† | 95% Exact CIs | Expected PPV of diagnostic errors in an ideal EHR system* | 95% Exact CIs | ||
| n | n | % | n | % | % | ||||
| Site A T1 | 95 | 454 | 20.9% | 17.3 to 25.0 | 74 | 16.3% | 13.0 to 20.0 | 25.0% | 20.7 to 29.7 |
| Site A T2 | 23 | 432 | 5.3% | 3.4 to 7.9 | 50 | 11.6% | 8.7 to 15.0 | 6.0% | 3.9 to 8.9 |
| Site A control | 11 | 414 | 2.7% | 1.3 to 4.7 | 7 | 1.7% | 0.70 to 3.4 | 2.7% | 1.4 to 4.8 |
| Site B T1 | 46 | 220 | 20.9% | 15.7 to 26.9 | 31 | 14.1% | 9.8 to 19.4 | 24.3% | 18.4 to 31.1 |
| Site B T2 | 13 | 237 | 5.5% | 3.0 to 9.2 | 14 | 5.9% | 3.3 to 9.7 | 5.8% | 3.1 to 9.8 |
| Site B control | 2 | 200 | 1.0% | 0.12 to 3.6 | 13 | 6.5% | 3.5 to 10.9 | 1.1% | 0.13 to 3.8 |
| Overall | 190 | 1957 | 189 | ||||||
↵* Calculation: Numerator is the total number of errors and denominator is the total number 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.
EHR, electronic health record; T1, Trigger 1; T2, Trigger 2.