Table 2.

Characteristics of NSCLC patients and cancer-free smokers in cohort 2 ^*.

	NSCLC cases (n = 166)	Controls (n = 213)
Age	67.25 (SD 10.94)	66.18 (SD 11.15)
Sex
Female	64	82
Male	102	131
Race
White	122	155
African American	44	58
Pack-years (median)	36.37	35.49
Stage
Stage I	68
Stage II	46
Stage III-IV	52
Histological type
Adenocarcinoma	86
Squamous cell carcinoma	80
Locations
Central tumors	78
Peripheral tumors	88

Abbreviations: NSCLC, non-small cell lung cancer.

^⁎All p > 0.05.