Tewes 1990.

Study characteristics
Methods	HCC in China
Participants	Participants: 200 cases and 200 controls (all women) Inclusion criteria: female Chinese participants living in Hong Kong, mean age 61.8 (SD 10.0) for cases and 60.6 (SD 9.6) for controls. Recruitment: from 1981‐1983
Interventions	N/A
Outcomes	Number of cases Lung cancer: 200 cases (all women)
Green tea in exposure categories	Exposure assessment: drinking habit Lowest exposure: no drinking Highest exposure: usually drinking
Notes	Funding: not declared Statistical methods: conditional logistic regression Variables controlled in analysis: age, number of live births, schooling, smoking habits, alcohol drinking, frequency of consumption/month of fresh vegetables and fruits. Variables controlled by matching: age and district of residence.