Table 1.

Characteristics of healthy controls and NSCLC patients

Characteristics	Healthy controls (n = 20)	NSCLC patients (n = 138)	χ 2	P Value
Age (≤60/>60)	12/8	75/60	0.140	0.709
Gender (M/F)	16/4	117/21	0.300	0.584
Smoking status (Y/N)	6/14	42/96	0.002	0.968
Histologic type (Squ/Ade/Oth)	N/A	67/48/23	N/A	N/A
Stage (IIIB/IV)	N/A	53/83	N/A	N/A
Performance status (0/1/2/3)	N/A	35/47/32/24	N/A	N/A

Squ, Squamous cell carcinoma; Ade, Adenocarcinoma; Oth, Others; N/A, Not applicable.