Table 3.

Diagnostic accuracy of FNA and intraoperative FS.

Bethesda Category	FS	Pathology		Accuracy rate		P value
		M	B	FNA	FS
I	M	38	0		91.25%
	B	7	35
II	M	38	0	61.94%	90.30%	<0.001
	B	13	83
III, IV	M	34	0	50.55%	87.91%	0.001
	B	11	46
V, VI	M	825	0	97.31%	91.40%	<0.001
	B	80	25

Note: M, malignant; B, benign; FNA, fine needle aspiration; FS, frozen section.