Table 1. Clinical characteristics of patients with lung cancer and benign diseases.

	Lung cancer (n = 48)	Benign diseases (n = 40)	P value
Age, years			0.288
Mean ± SEM	62.7 ± 1.4	60.7 ± 1.3
Gender, n (%)			0.329
Male	39 (81.3%)	29 (72.5%)
Female	9 (18.7%)	11 (27.5%)
Smoking status, n (%)			0.842
Smokers	29 (60.4%)	25 (62.5%)
Non-smokers	19 (39.6%)	15 (37.5%)
Pack-years	49.8 ± 6.5	45.4 ± 6.0	0.732
Cell type, n (%)
Squamous cell carcinoma	18 (37.5%)
Adenocarcinoma	18 (37.5%)
Small-cell lung cancer	12 (25.0%)
TNM stage, n (%)
I	8 (16.7%)
II	14 (29.2%)
III	10 (20.8%)
IV	16 (33.3%)