Definition and calculation of the statistical parameters
| Type | Cytology | USG | Scintigraphy | Histopathology | |
| TP | Malignant or suspicious | Solid | Cold | Malignant | |
| TN | Benign cells | Cystic or mixed | Hot or warm | Benign | |
| FP | Malignant or suspicious | Solid | Cold | Benign | |
| FN | Benign cells | Cystic or mixed | Hot or warm | Malignant | |
| Sensitivity | = TP/(TP+FN) | ||||
| Specificity | = TN/(TN+FP) | ||||
| Accuracy | = (TP+TN)/(TP+TN+FP+FN) | ||||
| Positive predictive value | = TP/(TP+FP) | ||||
| Negative predictive value | = TN/(TN+FN) | ||||
USG, thyroid ultrasonography; TP, true positive; TN, true negative; FP, false positive; FN, false negative.