Table 4.
Accuracy Indices for HBsAg Detection in Oral Fluid Samples Collected using the Salivette Device and Tested with HBsAg One According to the CO Value
| Manufacturer's CO: | ROC analysis | |||
|---|---|---|---|---|
| NCX + 0.05 | curve 0.024 | |||
| n = 190a | (CI 95%) | n = 191 | (CI 95%) | |
| Sensitivity% | 31.8 | (13.9–54.9) | 78.3 | (53.3–92.5) |
| Specificity% | 99.4 | (96.7–99.9) | 89.9 | (84.3–93.9) |
| PPV% | 87.5 | (47.3–99.7) | 51.4 | (99.9–68.7) |
| NPV% | 91.8 | (86.8–95.3) | 96.8 | (92.7–98.9) |
| k% | 43 | 55 | ||
a
Total does not equal 191 individuals because one pair of serum and oral fluid samples gave an undetermined result.
NCX, negative control media; ROC, receiver operating characteristic; PPV, positive predictive value; NPV, negative predictive value; CI, confidence interval.