Table 3 Performance of the Clearview with PCR test in detection of C trachomatis infection by symptom of anatomical site.
| Symptom | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|
| Vaginal discharge | ||||
| Yes (n = 921) | 36.6 | 99.2 | 88.2 | 91.0 |
| No (n = 576) | 26.9 | 99.0 | 80.8 | 89.6 |
| Cervical discharge† | ||||
| Yes (n = 537) | 62.0** | 96.5 | 75.4 | 93.6 |
| No (n = 960) | 41.5 | 98.7 | 81.7 | 92.3 |
| Vaginal discharge‡ | ||||
| Yes (n = 921) | 53.3 | 97.0 | 72.7* | 93.3 |
| No (n = 576) | 44.2 | 99.4 | 91.9 | 92.0 |
*p<0.05 and **p<0.01, the p values (χ2 test) refer to the differences between having and not having discharge symptoms in terms of anatomical sites of the discharge.
†Performance as compared to PCR test using the corresponding specimens.
‡Performance as compared to PCR test using cervical specimens.
NPV, negative predictive value; PCR, polymerase chain reaction; PPV, positive predictive value.