Matrix metalloproteinase-9-1562C>T polymorphism may increase the risk of lymphatic metastasis of colorectal cancer

Table 1 Characteristics of cases and controls

	Controls/cases	OR	95% CI
Sex
Male	101/70	1
Female	98/67	0.986	(0.638-1.524)
Age (yr)
≤ 60	98/60	1
> 60	101/77	1.245	(0.804-1.928)
Smoking status
Non-smoker	147/75	1
Smoker	52/62	2.337	(1.473-3.708)b
Alcohol duration (yr)
Never	168/103	1
1-15	16/14	1.427	(0.669-3.046)
>15	15/20	2.175	(1.066-4.437)
BMI (kg/m2)
18.5-22.9	101/35	1
23-24.9	38/54	4.101	(2.329-7.220)
> 25	60/48	2.309	(1.345-3.962)d

^bP < 0.001 vs non-smoker group (Two-sided χ² test);

^dP < 0.001 vs normal BMI group (Two-sided χ² test).