Hemelt 2010.

Study characteristics
Methods	HCC in China
Participants	Participants: 432 (male/female: 358/74) and 392 (male/female: 299/93) controls Inclusion criteria: all incident bladder cancer cases (ICD‐10 C67), aged ≥ 40 years, admitted to 4 hospitals (First Affliated Hospital in Hangzhou, First Municipal Hospital in Guangzhou, Tongji Hospital in Wuhan and Second Xiangya Hospital in Changsha), China Recruitment: from October 2005‐June 2008
Interventions	N/A
Outcomes	Number of cases Bladder cancer: 419 out of 432 eligible cases, mainly urothelial carcinoma (N = 323), followed by adenocarcinoma (N = 11) and squamous cell carcinoma (N = 7)
Green tea in exposure categories	Exposure assessment 1: green tea drinking Lowest exposure: no Highest exposure: yes Exposure assessment 2: green tea drinking Lowest exposure: no Intermediate exposure: < daily Highest exposure: daily, further divided in < 4 cups/d and ≥ 4 cups/d
Notes	Funding: not declared Statistical methods: unconditional logistic regression Variables controlled in analysis: age, sex, smoking status, smoking frequency and smoking duration. Hospital was modelled as a random effect Variables controlled by matching: sex and age (± 5 years)