Table 1.
2 × 2 contingency tables and performance characteristics of four algorithms (including outside cases) for the identification of incident syphilis among HIV-positive men who have sex with men, Boston, MA, 2016–2017.
| Algorithm A | Algorithm B | ||||||
|---|---|---|---|---|---|---|---|
| Chart review |
Chart review |
||||||
| Algorithm | Positive | Negative | Total | Algorithm | Positive | Negative | Total |
| Positive | 150 | 5 | 155 | Positive | 157 | 6 | 163 |
| Negative | 52 | 1518 | 1570 | Negative | 45 | 1517 | 1562 |
| Total | 202 | 1523 | 1725 | Total | 202 | 1523 | 1725 |
| Sens, % | Spec, % | PPV, % | NPV, % | Sens, % | Spec, % | PPV, % | NPV, % |
| 74.2 | 99.7 | 96.8 | 96.7 | 77.7 | 99.6 | 96.3 | 97.1 |
| Algorithm C | Algorithm D | ||||||
| Chart review |
Chart review |
||||||
| Algorithm | Positive | Negative | Total | Algorithm | Positive | Negative | Total |
| Positive | 166 | 4 | 170 | Positive | 169 | 5 | 174 |
| Negative | 36 | 1520 | 1556 | Negative | 33 | 1518 | 1551 |
| Total | 202 | 1524 | 1726 | Total | 202 | 1523 | 1725 |
| Sens, % | Spec, % | PPV, % | NPV, % | Sens, % | Spec, % | PPV, % | NPV, % |
| 82.2 | 99.7 | 97.6 | 97.7 | 83.7 | 99.7 | 97.1 | 97.9 |
NPV, negative predictive value; PPV, positive predictive value; RPR, rapid plama reagin; sens, sensitivity; spec, specificity