Table 7.

Diagnostic efficacy of ultrasound signs of malignant thyroid nodules.

Ultrasound signs	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Accuracy	Positive likelihood ratio	Odds ratio
Microcalcification	51.23	88.87	45.66	88.78	83.08	4.62	10.661
Envelope invaded	34.25	95.12	56.02	88.81	85.72	6.99	10.089
Reality	100.00	30.23	20.73	62.29	40.98	1.43	18.352
Low echo	87.81	55.57	26.48	96.16	60.51	1.98	9.123
Irregular shape	60.99	84.55	47.18	92.49	83.45	4.91	10.994
Aspect ratio ≥1	58.55	94.23	64.88	92.56	88.73	10.14	23.024
Far field	48.77	90.22	47.63	90.63	83.82	4.98	13.031
Unclear edges	60.98	83.67	39.16	92.08	73.32	3.53	7.453