Table 3.

Risk of malignancy according to initial US features and imaging-cytologic correlation in thyroid nodules with benign cytologic results.

	Number of nodules	Number of malignant nodules	Risk of malignancy (%)
Benign cytology alone	667	11	1.6 (0.8, 2.9)
Initial no suspicious US	597	3	0.5 (0.1, 1.5)
Initial suspicious US	70	8	11.4 (5.1, 21.3)
Concordant lesion to benign cytology in postbiopsy correlation	637	4	0.6 (0.2, 1.6)
Discordant lesion to benign cytology in postbiopsy correlation	30	7	23.3 (9.9, 42.3)

Data in parentheses are 95% confidence intervals.