Zhang 2008.

Study characteristics
Methods	HCC in China
Participants	Participants: 107 (male/female: 66/41) cases and 110 (male/female: 70/40) controls Inclusion criteria: aged 16/81 years, histopathologically confirmed cases Zhejiang University residents in Hangzhou, Zhejiang Province, China Recruitment: from 2005‐2006
Interventions	N/A
Outcomes	Number of cases Leukaemia: 107 (male/female: 66/41) cases, including acute myeloid leukaemia (N = 72), acute lymphocytic leukaemia (N = 22), chronic myeloid leukaemia (N = 10), chronic lymphocytic leukaemia (N = 3)
Green tea in exposure categories	Exposure assessment A: intake of green tea Lowest exposure: no Highest exposure: yes Exposure assessment B: consumption of green tea Lowest exposure: nondrinkers or ≤ 1 time/week Intermediate exposure: 2‐6 times/week Highest exposure: ≥ 1 time/d
Notes	Funding: not declared Statistical methods: unconditional logistic regression Variables controlled in analysis: age, sex, residence, education, smoking, medication use of chloromycetin, occupational exposure to benzene and organophosphorous Variables controlled by matching: age and hospital Zhang 2008b reports same data as Zhang 2008 but paper in Chinese