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Performance of STI risk score at different cut-points
| 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 | ||
Efficiency = proportion of population that is tested
NNT = number needed to test to obtain one positive result
