Yang 2007

Methods	Case‐control study within a prospective cohort study in China
Participants	69,710 cohort participants (women) 256 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for age; education; household income; cigarette smoking; alcohol drinking; physical activity; body mass index; menopausal status; nonsteroidal antiinflammatory drug use; vitamin supplement use; prior histories of colorectal polyps and chronic ulcerative colitis; family history of colorectal cancer; and intakes of total energy, vegetables, fruits, and red meat.
Cancer type & time of follow‐up	Colon and rectal cancer (follow‐up 6 years)
Sponsor	USPHS grant and NIH intramural program, Division of Cancer Epidemiology and genetics
Notes	Non‐drinker: RR = 1.00 1 to 4 g green tea leaves/day: RR = 0.70 (95% CI, 0.47 to 1.02) ≥ 5 g green tea leaves/day: RR = 0.56 (95% CI, 0.32 to 0.98) p = 0.01