Wu 2009a.

Study characteristics
Methods	HCC in China
Participants	Participants: 142 cases and 142 control (all men) Inclusion criteria: aged ≥ 18 years, referring to the First, Second and Third affiliated hospitals of Shanshan University and the Sun Yat‐Sen University, Department of Urology, Cancer Center in Guangdong, China Recruitment: from May 2005‐March 2008
Interventions	N/A
Outcomes	Number of cases Prostate cancer: 142 cases (all men)
Green tea in exposure categories	Exposure assessment: green tea drinking habit Lowest exposure: occasionally or never Intermediate exposure 1: 3‐4 time/month Intermediate exposure 2: 1‐6 times/week Highest exposure: every d
Notes	Article in Chinese Funding: not declared Statistical methods: conditional logistic regression Variables controlled in analysis: age group (± 4‐5 years), ethnic group and type of residence Variables controlled by matching: age group (± 4‐5 years), ethnic group and type of residence