BMC Medical Genetics

Table 1 Frequency distribution of select characteristics

From: TNFSF15 promoter polymorphisms increase the susceptibility to small cell lung cancer: a case-control study

Variables	NSCLC					SCLC
	Case (n = 340)		Controls(n = 460)		P value^*	Case (n = 209)		Controls(n = 460)		P value^*
	No	(%)	No	(%)		No	(%)	No	(%)
Gender					0.301					0.862
Male	237	69.7	336	73.0		154	73.7	336	73.0
Female	103	30.3	124	27.0		55	26.3	124	27.0
Age					0.139					0.151
<60	187	55.0	277	60.2		138	66.0	277	60.2
≥ 60	153	45.0	183	39.8		71	34.0	183	39.8
Range	27–84		18–84			30–92		18–84
Median	58		56.2			55		56.2
Smoking status					0.252					0.431
Non-smoker	187	55.0	233	50.7		99	47.8	233	50.7
Smoker	153	45.0	227	49.3		110	52.2	227	49.3
Pack year of smoking					< 0.001					< 0.001
<30	59	38.6	153	67.4		37	33.7	153	67.4
≥ 30	94	61.4	74	32.6		73	66.4	74	32.6

^*Two-sided χ2 test

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