Table 2.
Results of chart reviews.
| Concepts | Reviewed samples | True signals | True signals percentage % | Examples of false positive |
|---|---|---|---|---|
| Absent sense of smell | 20 | 19 | 95.00% | “(−) altered/loss of smell”, were wrongly recognized as an affirmative/ positive attribute. |
| Ageustia | 20 | 19 | 95.00% | “Symptoms, n/v, fever, cough, loss of taste or smell or around anyone + for Covid 19.” |
| Mental Depression | 20 | 18 | 90.00% | One was recognized from a medical history title without any answers; the other came from a recommendation for further Psychosocial assessment. |
| Current some day smoker | 20 | 20 | 100.00% | |
| Smoking monitoring status | 20 | 19 | 95.00% | One is uncertain. “Smoking Status Not on file”. |
| Fever | 20 | 17 | 85.00% | Template issue. “The following ROS were reviewed and are negative, unless otherwise stated as +positive: 1 Constitutional: Fever; malaise” |
| Pericardial Fluid (neg) | 20 | 20 | 100.00% | |
| Hydrocephalus [neg] | 20 | 20 | 100.00% | |
| Hydronephroses | 20 | 20 | 100.00% | |
| Blood group AB Rh(D) negative (finding) | 20 | 0 | 0.00% | From blood typing tests. This signal was not specific to blood type AB+, but generated by other ABO blood types and Rh-positive patients. |
| Allergy test positive (finding) | 20 | 5 | 25.00% | The false positives were wrongly mapped from a sentence like “He /She has been exposed to covid, family member or friends have tested positive.” |
| Laurin-Sandrow syndrome | 20 | 20 | 100.00% | |
| Cough nonproductive | 20 | 20 | 100.00% | |
| In total | 260 | 217 | 83.46% |