Shrubsole 2009.

Study characteristics
Methods	PCC in China
Participants	Participants: 3371 cases and 3380 controls (all female) Inclusion criteria: Shanghai Breast Cancer Study, with newly diagnosed cases aged 25–70 years, resident of urban Shanghai and with no previous history of any cancer Recruitment: from August 1996‐March 1998 (phase 1) and from April 2002 to February 2005 (phase 2)
Interventions	N/A
Outcomes	Number of cases Breast cancer: 3371 cases
Green tea in exposure categories	Exposure assessment A: green tea intake Lowest exposure: never Highest exposure: ever Exposure assessment B: green tea consumption in tea leaves/month Lowest exposure: never regular Intermediate exposure 1: ≤ 50 g/month Intermediate exposure 2: 50‐< 100 g/month Intermediate exposure 3: 100‐< 225 g/month Highest exposure: ≥ 225 g/month
Notes	Funding: National Institute of Health National Cancer Institute (R01CA64277) Statistical methods: unconditional logistic regression Variables controlled in analysis: age, study phase, education, family history of breast cancer, personal history of fibroadenoma, age at menarche, parity, age at first live birth, age at menopause, physical activity, waist:hip ratio, total energy intake, total fruit and vegetable intake and fat intake Variables controlled by matching: age (± 5 years)