Bonner 2005

Methods	Case‐control study, population‐based in China
Participants	122 cases, 122 controls
Interventions	N/A
Outcomes	Association of green tea consumption with cancer risk Matched for age, gender, residence, type of heating and cooking fuel Adjusted for pack‐years of smoking
Cancer type & time of follow‐up	Lung cancer
Sponsor	Not declared
Notes	Smoky coal < 130 tons Non‐drinkers OR = 1.00 2 to 3 times/week OR = 1.91 (95% CI, 0.51 to 7.13) ≥ 1 times/day OR = 0.96 (95% CI, 0.25 to 3.74) p = 0.65 Smoky coal ≥ 130 tons Non‐drinkers OR = 1.00 2 to 3 times/week OR = 0.50 (95% CI, 0.17 to 1.47) ≥ 1 times/day OR = 0.73 (95% CI, 0.25 to 2.16) p = 0.61