Marker combination | Significant cultures missed | Percentage screened out | NPV | Sensitivity (%) | Specificity (%) |
---|---|---|---|---|---|
Sensitivity = true positives/(true positives+false negatives) ×100; specificity = true negatives/(true negatives+false positives) ×100; negative predictive value (NPV) = true negative/(true negative+false negative) ×100. | |||||
B, blood; L, leucocyte esterase; N, nitrite; P, protein. | |||||
L/N/B/P | 3 | 16.3 | 98.3 | 98.3 | 19.2 |
L/B/P | 4 | 16.8 | 97.8 | 97.8 | 19.8 |
L/N/B | 5 | 25.7 | 98.2 | 97.2 | 30.2 |
L/N/P | 6 | 28.2 | 98.0 | 96.7 | 33.1 |
N/B/P | 18 | 27.9 | 94.0 | 90.0 | 31.5 |
L/N | 17 | 48.0 | 96.7 | 90.6 | 55.8 |