Table 2.

Tea drinking and potential risk factors among cases and controls.

	Cases N	Controls N	cOR and 95% CI	aOR and 95% Cla
Years of green tea drinking
Never	111	216	Ref	Ref
<20	32	60	1.04 (0.64–1.69)	0.69 (0.36–1.32)
20–30	27	60	0.88 (0.53–1.46)	1.05 (0.55–1.99)
≥30	12	61	0.38 (0.20–0.74)	0.44 (0.19–0.96)
P trend			0.0131	0.1297
Monthly consumption of green tea (g/month)
Never	111	216	Ref	Ref
<125	23	42	1.07 (0.61–1.86)	1.21 (0.62–2.36)
125–250	24	50	0.93 (0.55–1.60)	0.76 (0.38–1.51)
≥250	21	70	0.58 (0.34–1.00)	0.55 (0.28–1.09)
P trend			0.0849	0.0806
Green tea concentration
Never	111	216	Ref	Ref
Low	10	20	0.97 (0.44–2.15)	0.84 (0.33–2.14)
Moderate	42	125	0.65 (0.43–0.99)	0.60 (0.34–1.05)
High	21	36	1.14 (0.63–2.04)	1.12 (0.54–2.31)
P trend			0.3190	0.4685
Green tea temperature
Never	111	216	Ref	Ref
Normal temperature	50	125	0.78 (0.52–1.16)	0.76 (0.45–1.31)
High temperature	14	47	0.58 (0.31–1.10)	0.50 (0.23–1.07)
P trend			0.0571	0.0688
Age (years) of green tea drinking onset
Never	111	216	Ref	Ref
>28	29	89	0.63 (0.39–1.02)	0.56 (0.30–1.02)
≤28	41	92	0.87 (0.56–1.34)	0.89 (0.49–1.60)
P trend			0.3159	0.5411
Alcohol drinking
Never/occasionally	116	279	Ref	Ref
Often/everyday	76	133	1.37 (0.96–1.96)	1.29 (0.79–2.09)
Drinks per day (1960–1999)
Never	123	248	Ref	Ref
0–2	29	66	0.89 (0.54–1.44)	0.90 (0.49–1.65)
>2	52	101	1.04 (0.70–1.55)	1.30 (0.75–2.25)
P trend			0.9322	0.3719
Pack–year of smoking
Never	85	217	Ref	Ref
<20	53	85	1.59 (1.04–2.44)	1.12 (0.62–2.01)
20–40	42	86	1.25 (0.80–1.95)	0.88 (0.48–1.64)
≥40	12	26	1.18 (0.57–2.44)	0.92 (0.35–2.37)
P trend			0.2768	0.6904
HBV infection
HBsAg−	72	312	Ref	Ref
HBsAg+	132	102	5.61 (3.90–8.07)	5.07 (3.38–7.60)
HCV infection
Anti-HCV−	183	403	Ref	Ref
Anti-HCV+	18	12	3.03 (1.56–7.00)	4.44 (1.82–10.85)
Moldy food intake
No	143	339	Ref	Ref
Yes	48	66	1.72 (1.13–2.62)	2.39 (1.44–3.98)
Using refrigerator
No	173	305	Ref	Ref
Yes	18	86	0.37 (0.22–0.63)	0.36 (0.19–0.69)
Raw water drinking
Never	95	248	Ref	Ref
Few/ever	27	44	1.60 (0.94–2.73)	1.84 (0.96–3.53)
Sometimes	52	62	2.19 (1.41–3.39)	2.18 (1.30–3.67)
Often	11	5	5.74 (1.94–16.97)	3.78 (0.96–14.96)
P trend			<0001	0.0006
Tap water drinking
Never use tap water	151	263	Ref	Ref
Use tap water <3yrs	23	67	0.60 (0.36–1.00)	0.56 (0.30–1.02)
Use tap water >3yrs	30	85	0.61 (0.39–0.98)	0.63 (0.36–1.10)
P trend			0.0154	0.0416
Family history of liver cancer
No	150	375	Ref	Ref
Yes	53	39	3.40 (2.16–5.35)	3.06 (1.80–5.19)

^aAdjusted for age, gender, education, income, BMI, family history, pack-year, alcohol drinking and HBSAg.