Song 2008.

Study characteristics
Methods	PCC in USA
Participants	Participants: 781 cases and 1263 controls (all women) Inclusion criteria: aged 35‐74 years, diagnosed with a primary invasive or borderline epithelial ovarian cancer in English‐speaking women who had residential telephones at the time of cancer diagnosis and were residents of a 13‐county area of western Washington State, USA Recruitment: from 2002‐2005
Interventions	N/A
Outcomes	Number of cases Ovarian cancer: 781 cases
Green tea in exposure categories	Exposure assessment: green tea intake Lowest exposure: nondrinker Intermediate exposure: < 1 cup/d Highest exposure: ≥ 2 cups/d
Notes	Funding: National Institute of Health grant RO1 CA87538 Statistical methods: unconditional logistic regression Variables controlled in analysis: age, county, year of diagnosis/reference date, race/ethnicity, number of full‐term pregnancies, duration of hormonal contraception, education, BMI, smoking, tubal ligation/hysterectomy and family history of breast/ovarian cancer Variables controlled by matching: age, county of residence and year of diagnosis/reference date