Table 2 Performance characteristics of the dilution test compared to gold standard (N = 2895)
Dilution | Sensitivity (95 % CI) | Specificity (95 % CI) | PPV (95 % CI) | NPV (95 % CI) |
|---|---|---|---|---|
1/10 | 100 % (98.5-100) | 96.3 % (95.5-97.0) | 71.6 % (66.5-76.3) | 99.6 % (98.5-100) |
1/40 | 100 % (98.5-100) | 99.5 % (99.2-99.7) | 95.1 % (91.6-97.3) | 100 % (98.5-100) |
1/160 | 99.6 % (97.8-100) | 100 % (98.5-100) | 100 % (98.5-100) | 100 % (99.8-100) |
1/640 | 98.8 % (96.5-99.8) | 100 % (98.5-100) | 100 % (98.5-100) | 99.9 % (99.7-100) |
1/2560 | 97.2 % (94.3-98.9) | 100 % (98.5-100) | 100 % (98.5-100) | 99.7 % (99.5-99.9) |
1/10,240 | 89.5 % (85.0-93.0) | 100 % (98.5-100) | 100 % (98.3-100) | 99.0 % (98.6-99.4) |