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Table 7 Post-test probability of significant symptoms with a positive (LR 4.42) or negative dipstick (LR 0.53) test for nitrites [23]

From: Predicting acute uncomplicated urinary tract infection in women: a systematic review of the diagnostic accuracy of symptoms and signs

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) 91.5 (91.2-92.0) 56.5 (55.3-56.5)
  103 CFU/ml 62.3 (61.0-63.6) 88.0 (87.4-88.5) 46.7 (45.3-48.1)
  105 CFU/ml 51.1 (49.5-52.8) 82.2 (81.2-83.2) 35.6 (34.2-37.2)
Frequency 102 CFU/ml 67.8 (67.0-68.5) 90.3 (90.0-91.0) 52.7 (51.8-53.5)
  103 CFU/ml 58.6 (57.5-59.5) 86.2 (85.7-87.0) 42.9 (41.8-43.8)
  105 CFU/ml 47.8 (46.7-49.0) 80.2 (79.5-81.0) 32.7 (31.7-33.7)
Hematuria 102 CFU/ml 75.8 (70.9-80.1) 93.3 (91.5-95.0) 62.4 (56.4-68.1)
  103 CFU/ml 67.4 (60.6-73.6) 90.1 (87.2-92.5) 52.3 (44.9-59.6)
Nocturia 102 CFU/ml 69.4 (67.3-71.3) 91.0 (90.1-92.0) 54.6 (52.1-56.8)
  103 CFU/ml 60.8 (58.4-63.3) 87.3 (86.1-88.4) 45.1 (42.7-47.8)
Urgency 102 CFU/ml 69.8 (68.5-71.1) 91.0 (90.6-91.6) 55.1 (53.5-56.6)
  103 CFU/ml 61.7 (59.9-63.6) 87.7 (86.8-88.5) 46.1 (44.2-48.1)
  105 CFU/ml 49.1 (47.1-51.1) 81.0 (79.7-82.2) 33.8 (32.1-35.6)
Vaginal discharge 102 CFU/ml 54.1 (48.3 - 59.9) 84.0 (80.5-86.8) 38.4 (33.1-44.2)