Ui 2009.

Study characteristics
Methods	Cohort study in Japan
Participants	Participants: 52,029 participants. Final data on 41,761 (male/female: 19,749/22,012) participants included Inclusion criteria: aged 40‐79 years, living in 14 municipalities of Miyagi Prefecture in the catchment area of the Ohsaki Public Health Centre, Miyagi, Japan Parent cohort: Ohsaki Cohort Study Recruitment: from October‐December 1994 Data on the same cohort also reported in Kuriyama 2006 and Naganuma 2009.
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 December 2002 Liver cancer: 247 (male/female: 164/83) cases
Green tea in exposure categories	Exposure assessment: green tea consumption 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: Grant‐in‐Aid for Cancer Research and for the Third Term Comprehensive Ten‐Year Strategy for Cancer Control (H18‐3jigan‐ippan‐001), Ministry of Health, Labour and Welfare, in Japan Statistical methods: Cox proportional hazard regression Variables controlled in analysis: age, sex, alcohol consumption, smoking status, coffee consumption, vegetable consumption, dairy products consumption, fruit consumption, fish consumption and soybean consumption Variables controlled by matching: ‐