Peng 2015.

Study characteristics
Methods	PCC in China
Participants	Participants: 285 (male/female: 168/117) cases and 570 (male/female: 336/234) controls of unrelated ethnic Han Chinese from AnXi or the surrounding regions Inclusion criteria: histologically confirmed oesophageal squamous cell carcinoma, at AnXi Hospital in the Fujian Province of China Recruitment: from June 2010‐May 2011
Interventions	N/A
Outcomes	Number of cases Oesophageal cancer: 285 (male/female: 168/117) cases of oesophageal squamous cell carcinoma
Green tea in exposure categories	Exposure assessment: green tea drinking Lowest exposure: no Highest exposure: yes, defined as drinking at least 1 cup of green tea/week for > 6 months
Notes	Funding: grants from the Program for Outstanding Young Talents of Scientific Research in University of Fujian Province, China (No. JA11106), the National Natural Science Foundation of China (No. 81473047), the Key Program of Scientific Research of Fujian Medical University (09ZD004) and the Foundation of Fujian Province Key Laboratory of Environment and Health (201405) Statistical methods: conditional logistic regression Variables controlled in analysis: age, sex, education, income, marital status, alcohol drinking, smoking, pickled vegetables, fresh vegetables and fruits, meat, family history of oesophageal squamous cell carcinoma, history of reflux oesophagitis and hot beverage/food intake Variables controlled by matching: sex and age (± 5 years), ethnicity and area of residence