Table 1. Baseline characteristics of Lung cancer patients and controls.

Characteristics	Patients = 167 (%)	Controls = 162 (%)	p-values
Age (Range)	63 (39–79)	36 (18–67)	0.04
Gender
Male	129 (77%)	100 (62%)	0.003
Female	38 (23%)	62 (38%)
Smoking status
Never	55 (33%)	120 (74%)	<0.001
Ex-smoker	55 (33%)	26 (16%)
Current smoker	57 (34%)	16 (10%)
Pack-years of smoking (Range)	21.6 (0–160)	0 (0–35)	ns
Histological Cell Type
Adenocarcinoma	101 (60%)
Squarmous cell carcinoma (SCC)	25 (15%)
Poorly differentiated	41 (25%)

*Smoking history was not obtained for the 100 controls.