Li 2008.

Study characteristics
Methods	Cohort study in Japan
Participants	Participants: 52,029 participants. Final data on 41,440 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
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 December 2001 Lung cancer: 302 (male/female: 227/75) 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, Japan Statistical methods: Cox proportional hazard regression Variables controlled in analysis: age, sex, education level, marital status, passive smoking, BMI, walking duration, family history of cancer, smoking status, number of cigarettes smoked/d, years of smoking, alcohol drinking, total energy intake/d and daily consumption of soybean products, total meat, total fish, dairy products, total fruits and total vegetables and consumption of coffee Variables controlled by matching: ‐