Han 2008.

Study characteristics
Methods	PCC in China
Participants	Participants: 523 cases (male/female: 365/158) and 1924 (male/female: 1367/557) controls Inclusion criteria: newly diagnosed cases 35‐79 years of age; residence in Dafeng City, China Recruitment: from January 2003 from Dafeng City Center for Disease Control and Prevention
Interventions	N/A
Outcomes	Number of cases Lung cancer: 523 (male/female: 365/158) cases
Green tea in exposure categories	Exposure assessment 1: green tea intake Lowest exposure: never drinking Highest exposure: drinking Exposure assessment 2: green tea consumption Lowest exposure: 0 g/month Intermediate exposure 1: 0‐49 g/month Intermediate exposure 2: 50‐99 g/month Highest exposure: ≥ 100 g/month
Notes	Article in Chinese Funding: Jiangsu Provincial Medical Engineering Key Talent Research Fund (RC2003090) Statistical methods: unconditional logistic regression Variables controlled in analysis: sex, age, education, income per capita, frequent exposure to cooking fumes, smoking habits, alcohol intake, family history of lung cancer, daily fruit and vegetable intake Variables controlled by matching: sex, age (± 2 years) and living in the same area.