Table 1. Distribution of selected demographic variables and risk factors in NSCLC cases and controls.

Variable	NSCLC cases (n=1193)		Controls (n=1056)		Pa
	n	%	n	%
Age (years)	58.92 ± 10.44		59.36 ± 9.19		0.293
Age (years)					0.330
<59	535	44.84	452	42.80
≥59	658	55.16	604	57.20
Sex					0.425
Male	642	53.81	586	55.65
Female	551	46.19	470	44.35
Smoking status					<0.001
Never	757	63.45	857	81.16
Ever	436	36.55	199	18.84
Alcohol use					<0.001
Never	946	79.30	967	91.83
Ever	247	20.70	89	8.17
BMI (kg/m2)					<0.001
<24	801	67.14	571	54.07
≥24	392	32.86	485	45.93
Type of NSCLC
SCC	182	15.26
Non-SCC	1,011	84.74
Stage
I	703	58.93
II	87	7.29
III	222	18.61
IV	181	15.17
Lymph node status
Positive	381	31.94
Negative	812	68.06

Bold values are statistically significant (P<0.05). Abbreviation: SCC, squamous cell carcinoma.

^aTwo-sided χ² test and Student’s t test.