Suzuki 2004

Methods	Case‐control study within a cohort study in Japan
Participants	35,004 cohort participants 222 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for age, types of health insurance, age at menarche, menopausal status age at first birth, parity, mother’s history of breast cancer, smoking current alcohol drinking, BMI and consumption frequencies of black tea and coffee.
Cancer type & time of follow‐up	Breast cancer (7 years follow‐up)
Sponsor	Not declared
Notes	< 1 cup/day: RR = 1.00 1 or 2 cups/day: RR = 0.87 (95% CI, 0.57 to 1.32) 3 or 4 cups/day: RR = 1.07 (95% CI, 0.73 to 1.57) ≥ 5 cups/day: RR =  0.84 (95% CI, 0.57 to 1.24) p = 0.69