Fu 2013.

Study characteristics
Methods	HCC in China
Participants	Participants: 723 (male/female: 485/238) cases and 857 (male/female: 576/281) controls Inclusion criteria: aged 30‐80 years, with incident and histologically confirmed oral squamous cell cancer from 8 cities in different parts of China Recruitment: from 2007‐2010
Interventions	N/A
Outcomes	Number of cases Oral cancer: 723 (male/female: 485/238) cases of squamous cell cancer
Green tea in exposure categories	Exposure assessment: intake of green tea Lowest exposure: < 4 g/d Intermediate exposure: 4‐7 g/d Highest exposure: ≥ 8 g/d
Notes	Funding: Grant (N. 06dz22026) from the Science and Technology Commission of Shanghai Municipality. Statistical methods: unconditional logistic regression Variables controlled in analysis: age, sex, long‐term residency area, years of education, tobacco smoking and alcohol drinking Variables controlled by matching: sex, age (± 5 years) and long‐term residency area.