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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)