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Calculation of sensitivity, specificity, PPV, NPV, and diagnostic accuracy (considering L3, L4, and L5 cases to be true positive)
| Indicators | Percentage |
|---|---|
| Sensitivity = TP/(TP + FN) | 145/(145 + 30) = 82.8% |
| Specificity = TN/(TN + FP) | 274/(274 + 7) = 97.5% |
| PPV = TP/(TP + FP) | 145/(145 + 7) = 95.3% |
| NPV = TN/(TN + FN) | 274/(274 + 30) = 90.1% |
| Diagnostic accuracy = (TP + TN)/(TP + TN + FP + FN) | (145 + 274)/(145 + 274 + 7 + 30) = 92% |
