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. Author manuscript; available in PMC: 2010 May 1.

Published in final edited form as: Environ Mol Mutagen. 2009 May;50(4):285–290. doi: 10.1002/em.20452

Table 1.

Distribution of demographic features in lung cancer cases and controls.

	Cases (%) N= 122	Controls (%) N=122	P value ^a
Age
<55	52 (43)	51 (42)
≥55	70 (57)	71 (58)	0.90
Sex
Male	79 (65)	79 (65)
Female	43 (35)	43 (35)	1.00
Pack-Years ^b
Non-smokers	9 (11)	10 (13)
< 25	27 (34)	36 (46)
≥25	43 (54)	33 (42)	0.26
Smoky coal use
<130	51 (42)	72 (59)
≥130	71 (58)	50 (41)	0.007

^a

Two-sided p value based on χ² test.

^b

Male smokers only.