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Table 8 Post-test probability of significant symptoms with a positive (LR 1.36) or negative dipstick (LR 0.36) test for leucocyte-esterase [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) 76.9 (76.0-76.9) 46.8 (45.7-46.8)
  103 CFU/ml 62.3 (61.0-63.6) 69.2 (68.0-70.4) 37.3 (36.0-38.6)
  105 CFU/ml 51.1 (49.5-52.8) 58.7 (57.1-60.3) 27.3 (26.1-28.7)
Frequency 102 CFU/ml 67.8 (67.0-68.5) 74.1 (73.4-74.7) 43.1 (42.2-43.9)
  103 CFU/ml 58.6 (57.5-59.5) 65.8 (64.8-66.6) 33.8 (32.8-34.6)
  105 CFU/ml 47.8 (46.7-49.0) 55.5 (54.4-56.6) 24.8 (24.0-25.7
Hematuria 102 CFU/ml 75.8 (70.9-80.1) 81.0 (76.8-84.6) 53.0 (46.7-59.2)
  103 CFU/ml 67.4 (60.6-73.6) 73.8 (67.7-79.1) 42.7 (35.6-50.1)
Nocturia 102 CFU/ml 69.4 (67.3-71.3) 75.5 (73.7-77.2) 44.9 (42.6-47.2)
  103 CFU/ml 60.8 (58.4-63.3) 67.8 (65.6-70.1) 35.8 (33.6-38.3)
Urgency 102 CFU/ml 69.8 (68.5-71.1) 75.9 (74.7-77.0) 45.4 (43.9-47.0)
  103 CFU/ml 61.7 (59.9-63.6) 68.7 (67.0-70.4) 36.7 (35.0-38.6)
  105 CFU/ml 49.1 (47.1-51.1) 56.7 (55.0-58.7) 25.8 (24.3-27.3)
Vaginal discharge 102 CFU/ml 54.1 (48.3 - 59.9) 61.6 (56.0-67.0) 29.8 (25.2-35.0)