Clinical scorea to predict laboratory diagnosis of urinary tract infection using European guidelines.b
| Cut-off point (% at or above cut-off point) | Sensitivity | Specificity | PPV | NPV | Correctly classified % | LR+ve | LR−ve |
| ≥0 (100%) | 100 | 0 | – | – | 62 | 1.00 | – |
| ≥1 (83%) | 92 | 31 | 69 | 71 | 69 | 1.34 | 0.25 |
| ≥2 (52%) | 65 | 69 | 77 | 54 | 66 | 2.07 | 0.51 |
| ≥3 (23%) | 31 | 90 | 84 | 44 | 53 | 3.15 | 0.77 |
| ≥4 (5%) | 7 | 99 | 95 | 39 | 42 | 11.52 | 0.93 |
| >4 (0%) | 0 | 100 | – | – | 38 | – | 1.00 |
↵a Score weighted according to rounded logistic coefficients based on sum of urine cloudiness = 1, urine smell = 1, moderately severe dysuria = 1, and moderately severe nocturia = 1.
↵b 103 colony-forming units per ml. PPV = positive predictive value. NPV = negative predictive value. LR+ve = likelihood ratio for a positive test. LR–ve = likelihood ratio for a negative test. Predictive value of the clinical score with the four independently predictive variables had an area under the ROC curve of 0.71 (95% CI = 0.67 to 0.76). Including a history of any haematuria (using a different cut-off for haematuria compared with other symptoms) slightly improved sensitivity of the clinical score: a score of two or more out of the five variables (62% of the sample) had sensitivity 75% (191/254) specificity = 61% (94/154), PPV = 76% (191/251), NPV = 60% (94/157) LR+ve = 1.93, and LR-ve = 0.41.