TABLE 2.
Measures of diagnostic accuracy of the Architect Chagas assay results
| Measurea | Result (no./total no.) | 95% CIb |
|---|---|---|
| Sensitivity (%) | 100 (108/108) | 99.54–100 |
| Specificity (%) | 97.56 (200/205) | 95.21–99.92 |
| Validity index (%) | 98.40 (308/313) | 96.85–99.95 |
| PPV (%) | 95.58 (108/113) | 91.34–99.81 |
| NPV (%) | 100 (200/200) | 99.75–100 |
| LR+ | 41.00 | 17.25–97.45 |
| LR− | ||
| Youden index | 0.98 | 0.95–1 |
a
PPV, positive predictive value; NPV, negative predictive value; LR+, positive likelihood ratio; LR−, negative likelihood ratio.
b
95% CI, 95% confidence interval.