XPC Lys939Gln polymorphism, smoking and risk of sporadic colorectal cancer among Malaysians

Table 1 Demographic characteristics of the study population n (%)

Variable	Cases (n = 255 )	Controls (n = 255)	P-value
Gender
Male	139 (54.5)	115 (45.1)	0.0341
Female	116 (45.5)	140 (54.9)
Mean age (yr)	53.17 ± 7.07	46.47 ± 12.02	0.086
Cigarette smoking
Yes	110	48	< 0.0011
No	145	207

¹Statistically significant.