Table 1.

Clinical and demographic characteristics of cases and controls

Variables		Case (N = 303)	Control (N = 200)	P
Age	Mean	59	55	0.7079
	Range	30–79	42–67
Gender	Male	223 (73.6%)	99(49.5%)	5e−14
	Female	59 (19.47%)	101(50.5%)
	Unknown	21 (6.93%)	0
Family history of cancer	YES	33 (10.89%)	–
	NO	270(89.11%)	–
Serum CEA	Mean	21.44	–
Serum CA199	Mean	22.87	–

P value was calculated with chi-square test