Table 2.

Comparison of baseline characteristics of nodules according to inclusion criteria among 1 cm or larger 1201 thyroid nodules with benign cytology.

	Included nodules	Excluded nodules	P value
Number of nodules	667	534
Mean age (years)∗	49.1 ± 12.0	50.7 ± 13.1	0.033
Gender			0.392
Male	83 (12.4)	76 (14.2)
Female	584 (87.6)	458 (85.8)
Mean nodule size (mm)∗	20.7 ± 10.1	21.0 ± 10.6	0.601
US final assessment			0.709
Probably benign	597 (89.5)	474 (88.8)
Suspicious malignant	70 (10.5)	60 (11.2)

Data in parentheses are percentages.

∗Data are the means ± standard deviations.