Nagano 2001

Methods	Case‐control study within a cohort study in Japan
Participants	38,540 cohort participants 4,069 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for gender, age, residence, radiation dose, smoking, alcohol, level of education and BMI
Cancer type & time of follow‐up	Various types of cancer (13 to 15 years follow‐up)
Sponsor	Radiation Effects Research Foundation, private non‐profit foundation funded by Japanese Ministry of health and Welfare and US Department of Energy, National Academy of Sciences
Notes	< 1 cup/day RR = 1.00 2 to 4 times/day RR = 1.0 (95% CI, 0.01 to 1.1) ≥5 times/day RR = 0.98 (95% CI, 0.88 to 1.1)