Wilkens 1996.

Study characteristics
Methods	PCC in USA
Participants	Participants: 261 (male/female: 195/66) cases and 522 (male/female: 390/132) controls Inclusion criteria: white or Japanese ancestry with newly diagnosed cancer referring to the 7 largest civilian hospitals on the island of Oahu, Hawaii, USA Recruitment: from 1977‐1986
Interventions	N/A
Outcomes	Number of cases Urinary tract cancer: 261 (male/female: 195/66) cases, mainly transitional cell cancer (95%), including urinary bladder (90%), renal pelvis (7%) and ureter (3%)
Green tea in exposure categories	Exposure assessment: green tea drinking habit Lowest exposure: first tertile Intermediate exposure: second tertile Highest exposure: third tertile Values of tertiles NR
Notes	Funding: National Cancer Institute grants R26 CA 25903 and NOl CA 15655 Statistical methods: conditional logistic regression Variables controlled in analysis: age, smoking status, pack‐years, employment in a high‐risk occupation, consumption of dark green vegetables in men and total vitamin C consumption in women. Variables controlled by matching: sex, age (± 5 years) and ethnic group