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Table 3 Performance of STI risk score at different cut-points

From: Identifying youth at high risk for sexually transmitted infections in community-based settings using a risk prediction tool: a validation study

 

Cutpoint 19

Cutpoint 23

 

% (n/N)

95% CI

% (n/N)

95% CI

Sensitivity

82.4% (140/170)

75.8, 87.8

75.9% (129/170)

68.7, 82.1

Specificity

45.6% (359/787)

42.1, 49.2

59.3% (467/787)

55.8, 62.8

Yield

24.7% (140/568)

21.2, 28.4

28.7% (129/449)

24.6, 33.2

Efficiency

59.4% (568/957)

56.2, 62.5

46.9% (449/957)

43.7, 50.1

NNT

4.1

 

3.5

 
  1. Efficiency = proportion of population that is tested
  2. NNT = number needed to test to obtain one positive result
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BMC Infectious Diseases

ISSN: 1471-2334

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