Association between polymorphism in CDKN2B-AS1 gene and its interaction with smoking on the risk of lung cancer in a Chinese population

Table 1 Distribution of demographic variables in lung cancer and controls

Risk factor	Lung cancer	Controls	P
	(N = 507)	(N = 542)
Age (mean ± SD)	59.20 ± 9.872	58.10 ± 11.504	0.096
Gender
Male	255 (50.3%)	262 (48.3%)	0.527
Female	252 (49.7%)	280 (51.7%)
Smoking status
Ever	217 (42.8%)	66 (12.2%)	< 0.001
Never	290 (57.2%)	476 (87.8%)
Stage
I,II	93 (18.3%)
III	146 (28.8%)
IV	84 (16.6%)
Missing	184 (36.3%)
Pathological type
AD	248 (48.92%)
SQ	125 (24.65%)
SCC	90 (17.75%)
Else	44 (8.68%)

AD lung adenocarcinoma, SQ lung squamous cell carcinoma, SCC small cell lung cancer

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