TABLE 1.
Comparison of XenoStrip rapid test performance to T. vaginalis culture in Seattle and Birmingham in 2002a
| Site | Prevalence (%)b | No. true positive | No. false positive | No. false negative | No. true negative | Sensitivity
|
Specificity
|
Predictive value (%)
|
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % | 95% CI | % | 95% CI | Positive
|
Negative
|
||||||||
| % | 95% CI | % | 95% CI | ||||||||||
| Seattle | 43/497 (8.65) | 33 | 1 | 10 | 453 | 76.7 | 61.4-88.2 | 99.8 | 98.8-99.9 | 97.1 | 84.7-99.9 | 97.8 | 96.1-98.9 |
| Birmingham | 92/439 (20.96) | 73 | 10 | 19 | 337 | 79.4 | 69.6-87.1 | 97.1 | 94.8-98.6 | 87.9 | 78.9-94.1 | 94.7 | 91.8-96.8 |
| Total | 135/936 (14.42) | 106 | 11 | 29 | 790 | 78.5 | 70.6-85.1 | 98.6 | 97.6-99.3 | 90.6 | 83.8-95.2 | 96.5 | 94.9-97.6 |
a
The gold standard is trichomonads visualized in culture.
b
That is, the number of positive samples/the total number of samples tested.