GSTM1, GSTT1, GSTP1 and CYP1A1 genetic polymorphisms and susceptibility to esophageal cancer in a French population: Different pattern of squamous cell carcinoma and adenocarcinoma

Table 2 Description of control and case populations

	Control n (%)	Case n (%)	SCC n (%)	ADC n (%)
Male	87 (0.67)	69 (0.87)	44 (0.85)	25 (0.93)
Female	43 (0.33)	10 (0.13)	8 (0.15)	2 (0.07)
Mean age (yr)	56 [19; 87]	62 [40; 85]	60 [40; 78]	66 [51; 85]
Tobacco duration12 (years of smoking)
Non-smokers	66 (0 .66)	6 (0.13)	2 (0.07)	4 (0.22)
1-19	13 (0.13)	2 (0.04)	0 (-)	2 (0.11)
+20	21 (0.21)	40 (0.83)	28 (0.93)	12 (0.67)
Alcohol consumption34 (g of ethanol per week)
0-228	11 (0.64)	13 (0.28)	4 (0.14)	9 (0.50)
228.5 - / + 470	6 (0.36)	35 (0.72)	26 (0.86)	9 (0.50)

¹Tobacco duration (year);

²Data were available for 77% of controls, 61% of cases, including 58% of SCC and 67% of ADC;

³Alcohol consumption (gram of ethanol per week);

⁴Data for alcohol consumption were available for only 13% of controls, 61% of cases, including 58% of SCC and 67% of ADC.