Table 1. Basic demographic characteristics of patients and nodules.

	Benign	Malignant	P value
Patient (n = 322)
Men/Women	49/167	30/76	0.274
Age#	52.8 ± 12.3 (20.0–78.0)	47.9 ± 13.2 (22.0–78.0)	0.001
20–35 (n = 28/24)	31.0 ± 4.1 (20.0–35.0)	31.4 ± 3.4 (22.0–35.0)	0.748
36–55 (n = 94/50)	48.3 ± 5.2 (36.0–55.0)	45.6 ± 6.7 (36.0–54.0)	0.017
56–78 (n = 94/32)	63.7 ± 5.7 (56.0–78.0)	63.8 ± 5.6 (57.0–78.0)	0.967
Nodule (n = 322)	216	106
Location			0.668
Left	99	48
Right	114	55
Isthmus	3	3
Nodule size (mm)#	14.0 ± 9.5 (5.0–56.0)	13.1 ± 7.0 (6.0–40.0)	0.332
≤ 10 (n = 84/39)	6.4 ± 1.3 (5.0–10.0)	7.5 ± 0.9 (6.0–10.0)	0.000
11–20 (n = 82/50)	12.9 ± 2.7 (11.0–20.0)	13.1 ± 2.6 (11.0–20.0)	0.822
> 20 (n = 50/17)	28.7 ± 7.6 (21.0–56.0)	26.2 ± 6.4 (21.0–40.0)	0.229

Note.—Data are means ± standard deviations.