Table II.
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) |
HRs 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.
Missing data on status of cigarette smoking for one participant.
P = 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.