Nakachi 2000

Methods	Case‐control study within a cohort study in Japan
Participants	8,552 cohort participants 488 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for age, gender, smoking, alcohol, vegetable and rice intake
Cancer type & time of follow‐up	Various types of cancer (11 years follow‐up)
Sponsor	Grant‐in‐Aid for Cancer Research, MInistry of Education, Science, Sports and Culture, Japan and Ministry of Health and Welfare, Japan (Grant from Smoking Research Foundation)
Notes	Total: ≤ 3 cups/day: RR = 1.00 4 to 9 cups/day: RR = 0.81 (95% CI, 0.52 to 1.27) ≥10 cups/day: RR = 0.59 (95% CI, 0.35 to 0.98) Men: ≤ 3 cups/day: RR = 1.00 4 to 9 cups/day: RR = 1.00 (95% CI, 0.50 to 2.04) ≥ 10 cups/day: RR = 0.54 (95% CI, 0.22 to 1.34) Women: ≤ 3 cups/day: RR = 1.00 4 to 9 cups/day: RR = 0.92 (95% CI, 0.64 to 1.31) ≥ 10 cups/day: RR = 0.57 (95% CI, 0.34 to 0.98) No p‐values provided