Table 2. Diagnostic performance of AFIAS for detecting HBsAg, anti-HBs, and anti-HCV.
| Sample N | TP | FN | TN | FP | Sensitivity % (95% CI) | Specificity % (95% CI) | |
|---|---|---|---|---|---|---|---|
| HBsAg | 1,500 | 399 | 1 | 1,092 | 8 | 99.8 (98.6–100.0) | 99.3 (98.6–99.69) |
| Anti-HBs | 500 | 200 | 0 | 300 | 0 | 100.0 (98.2–100.0) | 100.0 (98.8–100.0) |
| Anti-HCV | 1,500 | 395 | 5 | 1,090 | 10 | 98.8 (97.1–99.6) | 99.1 (98.3–99.6) |
Abbreviations: TP, true positive; FN, false negative; TN, true negative; FP, false positive; CI, confidence interval; HBsAg, hepatitis B surface antigen; anti-HBs, antibody to HBsAg; anti-HCV, antibody to hepatitis C virus.