Li 2008

Methods	Case‐control study within a population‐based cohort study in Japan
Participants	41,440 cohort participants 302 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for age, gender, education level, marital status, passive smoking, BMI, walking duration, family history of cancer, smoking status, number of cigarettes smoked per day, years of smoking, alcohol drinking, total energy intake per day and daily consumption of soybean products, total meat, total fish, dairy products, total fruits and total vegetables and consumption of coffee.
Cancer type & time of follow‐up	Lung cancer (7 years follow‐up)
Sponsor	By a grant‐in‐aid for Cancer Research and for the Third Term Comprehensive Ten‐Year Strategy for Cancer Control, Ministry of Health, Labour and Welfare, Japan
Notes	All: < 1 cup/day: HR = 1.00 1 or 2 cups/day: HR = 1.14 (95% CI, 0.80 to 1.62) 3 or 4 cups/day: HR = 1.18 (95% CI, 0.83 to 1.66) ≥5 cups/day: HR = 1.17 (95% CI, 0.85 to 1.61) p = 0.48 Women: < 1 cup/day: HR = 1.00 1 or 2 cups/day: HR = 1.48 (95% CI, 0.71 to 3.10) 3 or 4 cups/day: HR = 1.11 (95% CI, 0.52 to 2.37) ≥5 cups/day: HR = 1.30 (95% CI, 0.65 to 2.60) p = 0.71 Men: < 1 cup/day: HR = 1.00 1 or 2 cups/day: HR = 1.05 (95% CI, 0.70 to 1.57) 3 or 4 cups/day: HR = 1.21 (95% CI, 0.82 to 1.79) ≥5 cups/day: HR = 1.17 (95% CI, 0.82 to 1.68) p = 0.32