Tamura 2018.

Study characteristics
Methods	Cohort study in Japan
Participants	Participants: 30,824 (14,240/16,584) participants Inclusion criteria: aged ≥ 35 years, in residents in Takayama, Gifu Prefecture, Japan Recruitment: from 1 September 1992
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 March 2008 Liver cancer: 172 (male/female: 106/66) cases
Green tea in exposure categories	Exposure assessment: intake of green tea Lowest exposure: nondrinkers Intermediate exposure 1: < 1 time/d Intermediate exposure 2: 1 time/d Intermediate exposure 3: 2‐3 times/d Highest exposure: ≥ 4 times/d
Notes	Funding: grants from the Ministry of Education, Culture, Sports, Science and Technology and the Minister of Health, Labour and Welfare of Japan Statistical methods: Cox proportional hazard regression Variables controlled in analysis: age, sex, ethanol intake, smoking status, BMI, education, total energy intake, physical activity and medical history of diabetes mellitus. Variables controlled by matching: ‐