Hoshiyama 1992.

Study characteristics
Methods	PCC in Japan
Participants	Participants: 251 cases and 483 controls (all men) Inclusion criteria: histologically confirmed single and multiple stomach cancer cases admitted to the Saitama Cancer Center Hospital, living in the Saitama Prefecture for at least 10 years, Japan Recruitment: from August 1984‐July 1990
Interventions	N/A
Outcomes	Number of cases Stomach cancer: 419 out of 432 eligible cases: 216 single stomach cancer and 35 multiple stomach cancer (all men)
Green tea in exposure categories	Exposure assessment: green tea drinking Lowest exposure: ≤ 4 cups/d Intermediate exposure: 5‐7 cups/d Highest exposure: ≥ 8 cups/d
Notes	Funding: not declared Statistical methods: unconditional logistic regression Variables controlled in analysis: age and smoking status Variables controlled by matching: ‐