Table 1 Diagnostic 2 × 2 tables and parameters of IgG test by ELISA and IIP
IgG ELISA OD ratio > 1.1 | Patients | Controls | Total | Proportion (%) (95% CI) |
|---|---|---|---|---|
Positive | 88 | 0 | 88 | PPV = 100 (95.9–100) |
Negative | 58 | 38 | 96 | NPV = 39.6 (29.7–50.1) |
Total | 146 | 38 | 184 | Prevalence = 79.3 |
Proportion (%) (95% CI) | Sn = 60.3 (51.9–68.3) | Sp = 100 (90.7–100) | Accuracy = 68.5 (61.2–75.1) | |
IIP IgG titer > = 80 | Patients | Controls | Total | Proportion (%) (95% CI) |
|---|---|---|---|---|
Positive | 120 | 2 | 122 | PPV = 98.4 (94.2–99.8) |
Negative | 26 | 36 | 62 | NPV = 58.1 (44.8–70.5) |
Total | 146 | 38 | 184 | Prevalence = 79.3 |
Proportion (%) (95% CI) | Sn = 82.2 (75.0–88.0) | Sp = 94.7 (82.3–99.4) | Accuracy = 84.8 (78.8–89.6) | |