Leung 2016.

Study characteristics
Methods	PCC in China
Participants	Participants: 524 cases and 1587 controls (all women) from the Ovarian Cancer in Alberta and British Columbia (OVAL‐BC) Study Inclusion criteria: aged 20‐79 years, incident cases in residents in Alberta (AB) and aged 40‐79 years, incident cases in residents in British Columbia (BC), Canada Recruitment: from 2002‐2012
Interventions	N/A
Outcomes	Number of cases Epithelian ovarian cancer: 104 cases out of 524 eligible cases with information on green tea and 471 out of 1587 eligible controls
Green tea in exposure categories	Exposure assessment A: green tea intake Lowest exposure: nondrinkers Highest exposure: green tea drinker Exposure assessment B: green tea consumption Lowest exposure: nondrinkers Intermediate exposure 1: ≤ 1 lifetime cups‐years Intermediate exposure 2: 1‐5 lifetime cups‐years Highest exposure: > 5 lifetime cups‐years
Notes	Funding: grants from the Canadian Institutes for Health Research and by a grant from WorkSafe BC (formerly the Workers’ Compensation Board of British Columbia) Statistical methods: unconditional logistic regression Variables controlled in analysis: study site, reference or diagnosis age, race, educational level, BMI, smoking, lifetime average alcohol drinking, first‐degree female relative history of ovarian/breast cancer, years of oral contraceptive use, parity, menopausal status and hormone therapy use Variables controlled by matching: age (± 5 years)