Table 2. Patient characteristics.

Variables	Control (n=18)	Lung cancer (n=18)
Age (years)
Median [range]	61.5 [50–69]	58.5 [53–72]
Gender, n (%)
Female	11 (61.1)	9 (50.0)
Male	7 (38.9)	9 (50.0)
Tobacco and alcohol use, n (%)
Both	2 (11.1)	3 (16.7)
Tobacco only	3 (16.7)	2 (11.1)
Alcohol only	4 (22.2)	2 (11.1)
None	9 (50.0)	11 (61.1)
Family history of cancer, n (%)
Yes	1 (5.6)	2 (11.1)
No	17 (94.4)	16 (88.9)
Tumor location, n (%)
Left		8 (44.4)
Right		10 (55.6)
Maximum tumor diameter (cm)
Median [range]		3.1 [0.8–5.7]
Lymph node stage, n (%)
pN0		16 (88.9)
pN1		1 (5.6)
pN2–pN3		1 (5.6)
TNM stage, n (%)
0–I		14 (77.8)
II		3 (16.7)
III		1 (5.6)

TNM, tumor-node-metastasis