Inoue 2008.

Study characteristics
Methods	PCC in China
Participants	Participants: 63,257 (male/female: 27,959/35,298) participants, 380 cases and 662 controls (all female) Inclusion criteria: aged 40‐74 years, belonging to the Hokkien or Cantonese dialect group in Singapore, China Parent cohort: Singapore Chinese Health Study (SCHS) Recruitment: from April 1993‐December 1998
Interventions	N/A
Outcomes	Number of cases Outcome assessment: 31 July 2007 Breast cancer: 380 female breast cancer out of 736 eligible cases
Green tea in exposure categories	Exposure assessment: green tea intake Lowest exposure: none or < weekly Intermediate exposure: weekly to < daily Highest exposure: daily
Notes	Funding: National Cancer Institute, Bethesda, MD (R01‐CA55069, R35‐CA53890 and R01‐CA80205) Statistical methods: unconditional logistic regression Variables controlled in analysis: age, year of enrolment, education, dialect, BMI, age when period became regular, number of live births and black tea intake Variables controlled by matching: ‐