Table 1.
| 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 | — |
| ≥0.5 (86.7%), D | 91 (88 to 94) | 22 (16 to 29) | 69 (64 to 73) | 57 (44 to 69) | 67.3 | 1.17 (1.07 to 1.27) | 0.40 (0.27 to 0.59) |
| ≥1 (66.3%), F/A | 75 (70 to 79) | 50 (42 to 58) | 74 (69 to 79) | 51 (43 to 59) | 66.1 | 1.49 (1.26 to 1.75) | 0.51 (0.42 to 0.62) |
| ≥1.5 (39.8%), F/A +D | 48 (42 to 53) | 75 (68 to 81) | 79 (72 to 84) | 43 (37 to 49) | 57.1 | 1.92 (1.44 to 2.55) | 0.70 (0.63 to 0.78) |
| ≥2 (8.2%), F+A | 11 (8 to 15) | 96 (92 to 99) | 85 (70 to 94) | 36 (32 to 41) | 40.2 | 2.98 (1.28 to 6.96) | 0.93 (0.89 to 0.96) |
| ≥2.5 (4.9%), F+A+D | 7 (4 to 10) | 99 (95 to 100) | 92 (72 to 99) | 36 (32 to 40) | 38.6 | 5.79 (1.38 to 24.3) | 0.94 (0.91 to 0.97) |
a
Derived from sum of rounded logistic coefficients: dysuria 0.5, fever 1.0, and age >60 years 1.0.
b
Based on a cut-off value of ≥103 colony-forming units per ml. A = age >60 years. D = dysuria. F = fever. LR+ = likelihood ratio for a positive test. LR– = likelihood ratio for a negative test. NPV = negative predictive value. PPV = positive predictive value. UTI = urinary tract infection.