Table 2. Odds ratio (OR) of death from HCC by characteristics of smoking habits, smoking period and smoking average number.

	Anti-HCV positive group				Anti-HCV negative group
	Case	Control	ORa	95% CI	Case	Control	ORa	95% CI
Smoking habits
Never smoker	13	220	1.00		13	1604	1.00
Exsmoker	7	44	7.84	1.09–56.05	2	339	0.28	0.05–1.71
Current smoker	23	104	9.60	1.50–61.36	14	623	1.71	0.58–5.08
Smoking period (year)
Never smoker	13	220	1.00		13	1604	1.00
<35	11	46	11.02	1.67–72.64	3	425	0.49	0.10–2.33
35 or more	16	89	6.99	1.03–47.51	13	488	2.41	0.63–9.21
Smoking average number (cig/day)
Never smoker	13	220	1.00		13	1604	1.00
<10	0	11	—	—	1	76	1.00	0.11–8.84
10 to 19	12	45	12.47	1.82–85.56	4	303	0.84	0.21–3.38
20 or more	16	89	9.10	1.10–75.05	10	556	1.27	0.38–4.20

^aAdjusted for area, age, gender, past history of diabetes mellitus, past history of liver diseases and alcohol drinking habits.