Table 1.
Sensitivities, specificities, prevalence, and positive and negative predictive values of SD DUO compared to RPR and TPPA.
| N = 394 | RPR | TPPA | |||
|---|---|---|---|---|---|
|
|
|
||||
| + | − | + | − | ||
| SD DUO | + | 12 | 12 | 23 | 1 |
| − | 2 | 368 | 10 | 360 | |
| % | 95% CI | % | 95% CI | ||
|
|
|
||||
| Sensitivity | 85.7 | 57.2–98.2 | 69.7 | 51.3–84.4 | |
| Specificity | 96.8 | 94.4–98.4 | 99.7 | 98.5–100 | |
| Prevalence | 3.6 | 2.0–5.9 | 8.4 | 5.8–11.6 | |
| PPV | 50.0 | 29.1–70.9 | 95.8 | 78.9–99.9 | |
| NPV | 99.5 | 98.1–99.9 | 97.3 | 95.2–98.7 | |
NPV: negative predictive value; PPV: positive predictive value; RPR: rapid plasma reagin; TPPA: Treponema pallidum particle agglutination.