Oze 2014.

Study characteristics
Methods	PCC in Japan
Participants	Participants: 961 (male/female: 775/186) cases and 2883 (male/female: 2325/558) controls Inclusion criteria: aged 20‐79 years, from the Aichi Cancer Center Hospital (ACCH) in Aichi Prefecture, Japan Recruitment: from January 2001‐December 2005
Interventions	N/A
Outcomes	Number of cases Upper aerodigestive tract cancer: 922 (male/female: NR) cases of the 961 (male/female: 775/186) eligible cases, including 420 (male/female: NR) cases of oesophageal cancer and 502 (male/female: NR) cases of oral, pharyngeal and laryngeal cancer
Green tea in exposure categories	Exposure assessment: green tea drinking Lowest exposure: < daily Intermediate exposure 1: 1 cup/d Intermediate exposure 2: 2 cups/d Highest exposure: ≥ 3 cups/d
Notes	Funding: Ministry of Education, Science, Sports, Culture and Technology of Japan (Grants‐in‐Aid for Scientific Research); Ministry of Health, Labour and Welfare of Japan [Third‐Term Comprehensive 10‐Year Strategy for Cancer Control and Health and Labor Sciences Research Grant for Clinical Cancer Research (H24‐Gannorinshou‐Ippan‐006)]; National Cancer Center Research and Development Fund (24‐ A‐3); Foundation for Promotion of Cancer Research in Japan and Japan Society for the promotion of Science A3 Foresight Program Statistical methods: conditional logistic regression Variables controlled in analysis: age, sex, coffee and green tea intake, alcohol consumption, cumulative smoking, fruit and vegetable intake, BMI, occupation and frequency of rice intake Variables controlled by matching: sex and age (10‐year categories)