Wang 2013a.

Study characteristics
Methods	HCC in China
Participants	Participants: 157 cases and 314 controls (all women) Inclusion criteria: newly diagnosed and histologically confirmed cases in participants referring to Chung‐Shan Medical University Hospital Recruitment: from June 2009‐June 2011
Interventions	N/A
Outcomes	Number of cases Breast cancer: 157 cases (all women)
Green tea in exposure categories	Exposure assessment: green tea intake Lowest exposure: no (< 1 cup/d) Highest exposure: yes (≥ 1 cup/d)
Notes	Sponsor: grant CSH‐2010‐A‐03 from Chung‐Shan Medical University Hospital, Taiwan Statistical methods: conditional logistic regression Variables controlled in analysis: education level, age at menarche and past hormone therapy Variables controlled by matching: age (± 2 years)