Ide 2007

Methods	Case‐control study within a cohort study in Japan
Participants	50,221 cohort participants 37 cases, sub‐cohort control
Interventions	N/A
Outcomes	Incidence Adjusted for age, gender, smoking, alcohol, daily intake of various foods
Cancer type & time of follow‐up	Oral cancer (follow‐up mean of 10.3 years)
Sponsor	The Ministry of Education, Science, sports and Culture of Japan
Notes	All: < 1 cup/day HR = 1.00 1 to 2 cups/day HR = 0.65 (95% CI, 0.22 to 1.94) 3 to 4 cups/day HR = 0.69 (95% CI, 0.28 to 1.71) ≥ 5 cups green tea/day HR 0.44 (95% CI: 0.19 to 1.04) p = 0.07 Men: < 1 cup/day HR = 1.00 1 to 2 cups green tea/day HR 0.79 (95% CI: 0.18 to 3.57) 3 to 4 cups green tea/day HR 0.81 (95% CI: 0.22 to 3.03) ≥ 5 cups green tea/day HR 0.61 (95% CI: 0.18 to 2.06) p = 0.42 Women: < 1 cup/day HR = 1.00 1 to 2 cups green tea/day HR 0.51 (95% CI: 0.10 to 2.68) 3 to 4 cups green tea/day HR 0.60 (95% CI: 0.17 to 2.10) ≥ 5 cups green tea/day HR 0.31 (95% CI: 0.09 to 1.07) p = 0.08