Chyou 1993.

Study characteristics
Methods	Cohort study in USA
Participants	Participants: 7991 male participants out of 8006 recruited Inclusion criteria: American men of Japanese ancestry, born from 1990‐1919 and residing on the Hawaiian island of Oahu, Hawaii, USA Parent cohort: Honolulu Hearth Program Recruitment: from 1965‐1968
Interventions	N/A
Outcomes	Number of cases Outcome assessment: May 1991 Urinary tract cancer: 96 cases, including urinary bladder (N = 83), pelvis (N = 8) and ureter (N = 5)
Green tea in exposure categories	Exposure assessment: green tea intake Lowest exposure: almost never Highest exposure: not specified, probably merging 4 categories: < 2 times/week, 2‐4 times/week, almost daily, ≥ 1 time/d
Notes	Funding: grants provided by National Cancer Institute (R01 CA33644) Statistical methods: proportional hazard regression Variables controlled in analysis: age and smoking Variables controlled by matching: ‐