Mizoo 2013.

Study characteristics
Methods	HCC in Japan
Participants	Participants: 472 cases and 464 controls (all women) Inclusion criteria: aged ≥ 20 years, consecutive patients treated at the Okayama University Hospital, Okayama Rousai Hospital and Mizushima Kyodo Hospital in Okayama and at Kagawa Prefecture Central Hospital in Kagawa, Japan. Controls from women under breast cancer screening. Recruitment: from December 2010‐November 2011
Interventions	N/A
Outcomes	Number of cases Breast cancer: 472 cases
Green tea in exposure categories	Exposure assessment: green tea consumption Lowest exposure: < 1 time/week Intermediate exposure 1: 1 time/week Intermediate exposure 2: 2‐3 times/week Highest exposure: ≥ 4 times/week
Notes	Funding: Grant‐in‐Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan Statistical methods: unconditional logistic regression Variables controlled in analysis: age. Variables controlled by matching: ‐