Bonner 2005.

Study characteristics
Methods	PCC in China
Participants	Participants: 122 (male/female: 79/43) cases and 121 (male/female: 78/43) controls Inclusion criteria: newly diagnosed lung cancer, mean age 54.71 (SD 11.45) in cases and 54.44 (SD 11.97) in controls from residents of Xuan Weu, China Recruitment: from March 1995‐March 1996
Interventions	N/A
Outcomes	Number of cases Lung cancer: 122 (male/female: 79/43) cases
Green tea in exposure categories	Exposure assessment: intake of green tea Lowest exposure: never Intermediate exposure: 2‐3 times/week Highest exposure: ≥ 1 time/d
Notes	Funding: not declared Statistical methods: unconditional logistic regression Variables controlled in analysis: smoking (pack‐years) Variables controlled by matching: age, sex, village of residence, type of heating and cooking fuel