Table 9 Post-test probability of significant symptoms with a positive (LR 2.57) or negative dipstick (LR 0.15) test for nitrites and leucocyte-esterase combined [23]
Symptom | Reference standard | Pre-test probability (95%CI) (%) | Post-test probability (95%CI) (LR+) | Post-test probability (95%CI) (LR-) |
|---|---|---|---|---|
Dysuria | 102 CFU/ml | 71.0 (70.0-71.0) | 86.3(85.7-86.3) | 26.9 (25.9-26.9) |
| Â | 103 CFU/ml | 62.3 (61.0-63.6) | 80.9(80.1-81.8) | 19.9 (19.0-20.8) |
| Â | 105 CFU/ml | 51.1 (49.5-52.8) | 72.9(71.6-74.2) | 13.6 (12.8-14.3) |
Frequency | 102 CFU/ml | 67.8 (67.0-68.5) | 84.4(83.9-84.8) | 24.0 (23.3-24.6) |
| Â | 103 CFU/ml | 58.6 (57.5-59.5) | 78.4(77.7-79.1) | 17.5 (16.9-18.1) |
| Â | 105 CFU/ml | 47.8 (46.7-49.0) | 70.2(69.2-71.1) | 12.1 (11.6-12.6) |
Hematuria | 102 CFU/ml | 75.8 (70.9-80.1) | 89.0(86.2-91.2) | 32.0 (26.8-37.6) |
| Â | 103 CFU/ml | 67.4 (60.6-73.6) | 84.2(79.8-87.8) | 23.7 (18.7-29.5) |
Nocturia | 102 CFU/ml | 69.4 (67.3-71.3) | 85.4(84.1-86.5) | 25.4 (23.6-27.1) |
| Â | 103 CFU/ml | 60.8 (58.4-63.3) | 80.0(78.3-81.6) | 18.9 (17.4-20.6) |
Urgency | 102 CFU/ml | 69.8 (68.5-71.1) | 85.6(84.8-86.3) | 25.7 (24.6-27.0) |
| Â | 103 CFU/ml | 61.7 (59.9-63.6) | 80.5(79.3-81.8) | 19.5 (18.3-20.8) |
| Â | 105 CFU/ml | 49.1 (47.1-51.1) | 71.3(69.6-72.9) | 12.6 (11.8-13.6) |
Vaginal discharge | 102 CFU/ml | 54.1 (48.3 - 59.9) | 75.2 (71.0-79.3) | 15.0(12.3-18.3) |