Table II.

HR and 95% CI of colorectal cancer associated with green tea consumption, the SMHS (2002–2008)

		Colorectal cancer		Colon cancer		Rectal cancer
Regular green tea consumption	Person-years	No. of cases	HR (95% CI)a	No. of cases	HR (95% CI)a	No. of cases	HR (95% CI)a
All participants
No	91 040	100	1.0	60	1.0	40	1.0
Yes	182 736	143	0.77 (0.59, 1.01)	73	0.69 (0.48, 0.98)	70	0.89 (0.59, 1.34)
Non-smokers
No	43 744	54	1.0c	33	1.0	21	1.0
Yes	41 347	29	0.54 (0.34, 0.86)	17	0.51 (0.28, 0.93)	12	0.59 (0.29, 1.22)
Smokersb
No	47 290	46	1.0c	27	1.0	19	1.0
Yes	141 389	114	0.94 (0.66, 1.34)	56	0.82 (0.51, 1.30)	58	1.10 (0.65, 1.86)

^aHRs were adjusted for age, education, cigarette smoking, pack-years of cigarette smoking, alcohol consumption, regular exercise, body mass index, history of diabetes, family history of colorectal cancer and intakes of vegetables, fruits and red meat in a Cox model with age as the time scale.

^bMissing data on status of cigarette smoking for one participant.

^cP = 0.13 for interaction between ever smoking and green tea consumption; P = 0.06 for interaction between pack-years of cigarette smoking and green tea consumption.