Table 3.

Interactions between green tea and other risk factors.

		Cases N	Controls N	cOR and 95% CI	aOR and 95% CIa
Green tea drinking	Alcohol drks/day
Ever	<2	46	105	Ref	Ref
Ever	≥2	27	76	0.81 (0.46–1.42)	0.85 (0.44–1.64)
Never	≤2	86	191	1.03 (0.67–1.58)	0.93 (0.52–1.66)
Never	>2	25	25	2.28 (1.19–4.39)	2.68 (1.24–5.82)
OR for interaction				2.74 (1.20–6.27)	3.40 (1.26–9.16)
Green tea drinking	Smoking
Ever	Never	22	60	Ref	Ref
Ever	Ever	51	121	1.15 (0.64–2.07)	0.76 (0.38–1.55)
Never	Never	61	153	1.09 (0.61–1.93)	0.89 (0.41–1.90)
Never	Ever	50	63	2.17 (1.17–4.00)	1.34 (0.63–2.85)
OR for interaction				1.73 (0.81–3.69)	1.98 (0.78–5.03)
Green tea drinking	HBV/HCV infection
Ever	No	26	126	Ref	Ref
Ever	Yes	45	55	3.97 (2.23–7.06)	3.88 (2.10–7.19)
Never	No	31	163	0.92 (0.52–1.63)	1.01 (0.52–1.94)
Never	Yes	79	52	7.36 (4.26–12.74)	7.29 (3.84–13.82)
OR for interaction				2.02 (0.93–4.38)	1.87 (0.81–4.31)
Green tea drinking	AFB1
Ever	Low	35	117	Ref	Ref
Ever	High	32	44	2.43 (1.35–4.39)	2.17 (1.14–4.15)
Never	Low	57	127	1.50 (0.92–2.45)	1.55 (0.86–2.81)
Never	High	40	73	1.83 (1.07–3.14)	1.90 (1.00–3.61)
OR for interaction				0.50 (0.23–1.09)	0.56 (0.24–1.32)

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