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Table 6 Post-test probability of significant symptoms across three different reference standards 102, 103 and 105 CFU/ml

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

Symptom Reference standard* +LR (95%CI) Post-test probability
(95%CI) (%)
Dysuria 102 CFU/ml 1.30 (1.20-1.41) 71.0 (70.0-71.0)
  103 CFU/ml 1.31 (1.18-1.45) 62.3 (61.0-63.6)
  105 CFU/ml 1.22 (1.11-1.34) 51.1 (49.5-52.8)
Frequency 102 CFU/ml 1.10 (1.04-1.16) 67.8 (67.0-68.5)
  103 CFU/ml 1.12 (1.03-1.19) 58.6 (57.5-59.5)
  105 CFU/ml 1.09 (1.02-1.16) 47.8 (46.7-49.0)
Hematuria 102 CFU/ml 1.72 (1.30-2.27) 75.8 (70.9-80.1)
  103 CFU/ml 1.68 (1.06-2.66) 67.4 (60.6-73.6)
Nocturia 102 CFU/ml 1.30 (1.08-1.56) 69.4 (67.3-71.3)
  103 CFU/ml 1.37 (1.13-1.65) 60.8 (58.4-63.3)
Urgency 102 CFU/ml 1.22 (1.11-1.34) 69.8 (68.5-71.1)
  103 CFU/ml 1.28 (1.11-1.47) 61.7 (59.9-63.6)
  105 CFU/ml 1.17 (1.04-1.34) 49.1 (47.1-51.1)
Vaginal discharge 102 CFU/ml 0.65(0.51-0.83) 54.1 (48.3 - 59.9)
  1. * Pretest probability is 65.1% at ≥ 102 CFU/ml; 55.4% at ≥ 103 CFU/ml and 44.8% at ≥ 105 CFU/ml