Wang 2012b.

Study characteristics
Methods	HCC in China
Participants	Participants: 220 cases (male/female: 135/85) and 220 (male/female: 135/85) controls Inclusion criteria: participants with pathologically confirmed diagnosis and interviewed within 6 months of diagnosis referring at 5 hospitals (Xijing Hospital, Tangdu Hospital, Northwest Hospital, Xi'an Centre Hospital and Shaanxi Province People’s Hospital) in Xi'an, China. Recruitment: from August 2009‐December 2011
Interventions	N/A
Outcomes	Number of cases Multiple myeloma: 220 (male/female: 135/85) cases
Green tea in exposure categories	Exposure assessment: drinking habit Lowest exposure: never Intermediate exposure 1: 1‐3 times/month Intermediate exposure 2: 1‐2 times/ week Highest exposure: ≥ 3 times/week
Notes	Sponsor: China Special Grant for the Prevention and Control of Infectious Diseases (2009ZX10002‐027). Statistical methods: conditional logistic regression Variables controlled in analysis: age, sex, education, family history of cancer in first‐degree relatives and dietary risk factors (shallot and garlic, soy food, fried food, cured/smoked food, black tea, fish and brined vegetables, pickle or sauerkraut) Variables controlled by matching: sex, age (± 5 years) and inpatient hospital