Lin 2012.

Study characteristics
Methods	HCC in China
Participants	Participants: 170 (male/female: 102/68) cases and 340 (male/female: 204/136) controls Inclusion criteria: incident cancer aged < 80 years, diagnosed in Changhwa Christian Hospital (Changhwa County, Taiwan, China) Recruitment: from August 2004‐October 2008
Interventions	N/A
Outcomes	Number of cases Lung cancer: 170 (male/female: 102/68) cases, including adenocarcinoma (N = 93), squamous cell carcinoma (N = 46) and others (N = 31, including small‐cell carcinoma, neuroendocrine carcinoma, mixed cell carcinoma and unspecific malignant cell)
Green tea in exposure categories	Exposure assessment: green tea drinking Lowest exposure: 0 cup/d Intermediate exposure: < 1 cup/d Highest exposure: ≥ 1 cup/d
Notes	Funding: National Science Council, Taiwan (NSC‐98‐2815‐C‐040‐028‐B; NSC 95‐2815‐C‐040‐019‐B; NSC 93‐2815‐C‐040‐008‐B) Statistical methods: conditional logistic regression Variables controlled in analysis: sex and age Variables controlled by matching: sex and age (± 5 years)