Association of smoking, alcohol drinking and dietary factors with esophageal cancer in high- and low-risk areas of Jiangsu Province, China

Table 3 OR¹ and 95% CI of tobacco smoking in EC of Dafeng and Ganyu

Tobacco smoking		Dafeng (high-risk)	Ganyu (low-risk)
Smoking status2
	Former smoker	1.93 (0.91-4.08)	1.28 (0.28-5.83)
	Current smoker	2.42 (1.28-4.56)	2.36 (0.89-6.26)
	P value for trend	0.005	0.07
Duration of smoking (yr)2
	<20	2.02 (0.93-4.38)	1.60 (0.31-7.90)
	20-34	2.32 (1.15-4.67)	2.25 (0.80-6.35)
	≥35	1.80 (0.62-5.24)	0.98 (0.29-3.24)
	P value for trend	0.016	0.249
Duration of smoking (yr)2
	1-29	1.61 (0.67-3.86)	1.44 (0.46-4.42)
	30-49	2.65 (1.28-5.49)	2.04 (0.60-6.92)
	≥20	2.04 (0.78-5.35)	1.98 (0.43-9.11)
	P value for trend	0.009	0.194
Amount of smoking (Cig/d)2
	1-9	1.36 (0.50-3.74)	1.12 (0.27-4.68)
	10-19	2.21 (1.01-4.80)	1.56 (0.42-5.78)
	≥20	2.04 (1.00-4.18)	0.91 (0.32-2.61)
	P value for trend	0.015	0.915
Total consumption of cigarettes2
	1 (lowest)	1.40 (0.61-3.21)	0.96 (032-2.82)
	2	2.55 (1.06-6.14)	3.50 (0.37-32.8)
	3	1.88 (0.79-4.49)	1.94 (0.25-14.7)
	4 (highest)	1.81 (0.57-5.74)	0.74 (0.19-2.81)
	P value for trend	0.029	0.959

¹ Matched by age and gender, further adjusted for level of education, past economic status (group) and alcohol drinking;

² Never-smokers were used as the reference group.