Table 2.
| Cut-off point (% at or above cut-off point) | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | Correctly classified % | LR+ (95% CI) | LR– (95% CI) |
|---|---|---|---|---|---|---|---|
| ≥0 (100%) | 100 | 0 | — | — | 65.5 | 1 | — |
| ≥1 (71.0%), L | 82 (78 to 86) | 50 (43 to 58) | 76 (71 to 80) | 60 (51 to 68) | 71.2 | 1.65 (1.41 to 1.94) | 0.35 (0.28 to 0.45) |
| ≥2 (66.3%), N | 58 (52 to 63) | 88 (82 to 92) | 90 (85 to 94) | 52 (46 to 58) | 68.2 | 4.87 (3.19 to 7.43) | 0.48 (0.42 to 0.55) |
| ≥3 (37.3%), L+N | 52 (46 to 57) | 90 (84 to 94) | 91 (85 to 94) | 50 (44 to 55) | 64.9 | 5.14 (3.24 to 8.17) | 0.54 (0.48 to 0.60) |
a
Derived from sum of rounded logistic coefficients: leucocyte 1.0 and nitrite 2.0.
b
Based on a cut-off value of ≥103 colony-forming units per ml. L = leucocyte. LR+ = likelihood ratio for a positive test. LR– = likelihood ratio for a negative test. N = nitrite. NPV = negative predictive value. PPV = positive predictive value. UTI = urinary tract infection.