Table 2.

Participant characteristics of the FTA and FTC groups.

Variable		Category/Group		FTA		FTC		P-value
Age				48.89 ± 12.96		44.77 ± 15.89		0.01
Sex		Female		150 (81.97%)		111 (77.08%)		0.34
		Male		33 (18.03%)		33 (22.92%)
Diameter		< 2 cm		22 (12.02%)		17 (11.81%)		0.55
		> 2 cm		34 (18.58%)		26 (18.06%)
		> 3 cm		48 (26.23%)		29 (20.14%)
		> 4 cm		79 (43.17%)		72 (50.00%)
Composition		Cystic		23 (12.57%)		2 (1.39%)		0.00
		Solid		159 (86.89%)		141 (97.92%)
		Predominantly solid		1 (0.55%)		1 (0.69%)
Margin		Regular		171 (93.44%)		61 (42.36%)		0.00
		Irregular		12 (6.56%)		83 (57.64%)
Halo		Absent		174 (95.08%)		101 (70.14%)		0.00
		Irregular halo		9 (4.92%)		43 (29.86%)
Echo		Anechoic		3 (1.64%)		0 (0.00%)		0.00
		Isoechoic		169 (92.35%)		119 (82.64%)
		Very hypoechoic		11 (6.01%)		25 (17.36%)
Texture		Even		105 (57.38%)		20 (13.89%)		0.00
		Uneven		78 (42.62%)		124 (86.11%)
Internal septations		Absent		183 (100.00%)		134 (93.06%)		0.00
		Present		0 (0.00%)		10 (6.94%)
Nodule within nodule		Absent		183 (100%)		141 (97.92%)		0.17
		Present		0 (0.00%)		3 (2.08%)
Calcifications		Absent		172 (93.99%)		113 (78.47%)		0.00
		Present		11 (6.01%)		31 (21.52%)
ACR-TIRADS		ACR-TR1		0 (0.00%)		0 (0.00%)
		ACR-TR2		56 (30.60%)		7 (4.86%)		0.00
		ACR-TR3		79 (43.17%)		28 (19.44%)
		ACR-TR4		48 (26.23%)		109 (75.7%)
		ACR-TR5		0 (0.00%)		O (0.00%)
C-TIRADS		C-TR2		0 (0.00%)		0 (0.00%)
		C-TR3		182 (99.45%)		132 (91.67%)		0.00
		C-TR4A		1 (0.55%)		12 (8.33%)
		C-TR4B to 5		0 (0.00%)		0 (0.00%)

TI-RADS, Thyroid Imaging Reporting and Data System; ACR, American College of.

TI-RADS, Thyroid Imaging Reporting and Data System; ACR, American College of Radiology; C–TI-RADS, Chinese TI-RADS; SD, standard deviation; FTA, follicular thyroid adenoma; FTC, follicular thyroid cancer.