Suzuki 2005.

Study characteristics
Methods	Cohort study in Japan
Participants	Participants: 31,345 (male/female: 13,992/17,353) from cohort 1 and 47,605 (male/female: 22,836/24,769) from cohort 2. Final included participants were 26,311 (male/female: NR) from cohort 1 and 39,604 (male/female: NR) from cohort 2 Inclusion criteria: aged ≥ 40 years, residents in 3 municipalities of the Miyagi Prefecture, Northern Japan (cohort 1); aged 40‐64 years (cohort 2) Parent cohorts Cohort 1: Three Prefecture Study ‐ Miyagi portion (3‐pref MIYAGI) Cohort 2: Miyagi Cohort Study (MIYAGI) Recruitment: from 1984 for cohort 1 and from 1990 for cohort 2 Same population and outcome of Tsubono 2001 in: Inoue 2009a for cohort 1 Characteristics of cohort 2 reported in Fukao 1995 in: Suzuki 2004. Same population also reported in Koizumi 2003 in:Koizumi 2003Inoue 2009a and Suzuki 2004
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 December 1992 for cohort 1 and 31 March 1997 for cohort 2 Colon cancer: 305 (male/female: 185/120) cases, 158 (male/female: NR) in cohort 1 and 147 (male/female: NR) in cohort 2 Rectal cancer: 211 (male/female: 119/92) cases 111 (male/female: NR) in cohort 1 and 100 (male/female: NR) in cohort 2
Green tea in exposure categories	Exposure assessment: green tea intake Lowest exposure: < 1 cup/d Intermediate exposure 1: 1‐2 cups/d Intermediate exposure 2: 3‐4 cups/d Highest exposure: ≥ 5 cups/d
Notes	Funding: not declared Statistical methods: Cox proportional hazard regression Variables controlled in analysis: age, family history of colorectal cancer, cigarette smoking, alcohol consumption, BMI and consumption of black tea and coffee Variables controlled by matching: ‐ Subsequent report on stomach cancer in Inoue 2009a, from which we used data in the analysis.