Iwai 2002.

Study characteristics
Methods	Cohort study in Japan
Participants	Participants: 4411 participants from the Tottori Prefecture, Japan. Data from 2855 (male/female: 1404/1451) participants, only men for cancer mortality Inclusion criteria: aged 40‐79 years Parent cohort: Japan Collaborative Cohort Study of Evaluation of Cancer Risk (JACC Study) Recruitment: from April‐May 1989
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 December 1999 Total cancer mortality: 31 cases (all men)
Green tea in exposure categories	Exposure assessment: frequency of green tea consumption Lowest exposure: < 0.5 cups/d Intermediate exposure: 0.5‐3 cups/d Highest exposure: ≥ 4 cups/d
Notes	Funding: Grant‐in‐Aid for Scientific Research from Monbusho, the Japanese Ministry of Education, Science and Culture (N.11181101) Statistical methods: Cox proportional hazard regression Variables controlled in analysis: coffee consumption, age, history of cancer and apoplexy, educational status and smoking status Variables controlled by matching: ‐