Table 2.

Comparison of different ultrasound signs in differentiating benign and malignant nodules.

Project	Ultrasound signs	Malignant (%)	Benign (%)	X2 value	P value
Ingredient	Reality	100	69.8	15.096	≤0.001
	Cysticity	0	30.2
Echo type	Low echo	87.8	44.5	24.389	≤0.001
	Wait for echo	12.2	55.7
Texture	Even	14.6	24.3	1.257	0.261
	Uneven	85.7	76.1
Form	Rule	39.3	84.9	48.198	≤0.001
	Irregular	61.2	12.5
Aspect ratio	≥1	58.3	5.9	76.277	≤0.001
	<1	41.5	94.3
Calcification	No	25.6	72.5	43.302	≤0.001
	Microcalcification	41.3	11.2
	Coarse calcification	33.1	16.8
Edge	Clear	39.2	82.5	33.813	≤0.001
	Not clear	61.5	17.3
Coating	Envelope invaded	34.2	6.8	31.514	≤0.001
	Good coating	65.9	93.2