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Equations for sensitivity, specificity, accuracy and relative risk
| Sensitivity | TP/(TP + FN) |
| Specificity | TN/(TN + FP) |
| Accuracy | (TP + TN)/(TP + TN + FP + FN) |
| LR+ | (Sensitivity)/(1 − specificity) |
| LR− | (1 − sensitivity)/(specificity) |
TP: true positive; TN: true negative; FP: false positive; FN: false negative; LR+: positive likelihood ratio; LR−: negative likelihood ratio.
