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Methods to calculate sensitivity, specificity, PPV, NPV and accuracy
| Abdominal ultrasound | |||
|---|---|---|---|
| Positive | Negative | ||
| Aorta Scan | |||
| Positive | TP | FP | PPV = TP/(TP + FP) |
| Negative | FN | TN | NPV = TN/(FN + TN) |
| Sensitivity = TP/(TP + FN) | Specificity = TN/(FP + TN) | Accuracy = (TP + TN)/All | |
FN false negative, FP false positive, NPV negative predictive value, PPV positive predictive value, TN true negative, TP true positive
