Sensitivity, specificity, predictive values and likelihood ratios for risk scoring system
| Risk score strata | Sensitivity | Specificity | Positive predictive value | Negative predictive value | Likelihood ratio# |
| ≥1 | 0.979 | 0.051 | 0.396 | 0.800 | 1.032 |
| ≥2 | 0.845 | 0.404 | 0.475 | 0.808 | 1.418 |
| ≥3 | 0.525 | 0.846 | 0.684 | 0.737 | 3.409 |
| =4 | 0.103 | 0.987 | 0.833 | 0.639 | 7.923 |
Results for each risk score level refer to findings where the score concerned is regarded as a positive test result and scores below that are regarded as negative results
#: likelihood ratio refers to sensitivity/(1–specificity)