Does Tumor Size Influence the Diagnostic Accuracy of Ultrasound-Guided Fine-Needle Aspiration Cytology for Thyroid Nodules?

Table 3

Diagnostic indices of fine-needle aspiration cytology (FNAC) in the five thyroid nodule size categories.

Group	A (≤0.5 cm)	B (>0.5–1 cm)	C (>1-2 cm)	D (>2–4 cm)	E (>4 cm)	value
Sensitivity	96.8	94.9	98.7	86.7	50	0.006
Specificity	100	93.9	100	100	100	0.575
PPV	100	98.8	100	100	100	0.745
NPV	76.9	77.5	97	92	85.7	0.076
Diagnostic accuracy	96.8	94.8	99	94.7	87.5	—

PPV: positive predictive value; NPV: negative predictive value.