Wang 1999.

Study characteristics
Methods	PCC in China
Participants	Participants: 209 cases (male/female: 129/80) and 209 (male/female: 129/80) controls Inclusion criteria: 35‐79 years of age; residence in Yangzhong, Jiangsu Province, China Recruitment: 2000
Interventions	N/A
Outcomes	Number of cases Oesophageal cancer: 68 cases Cardia (stomach) cancer: 69 cases Other stomach cancer: 72 cases
Green tea in exposure categories	Exposure assessment: drinking habit Lowest exposure: never drinking Highest exposure: drinking
Notes	Article in Chinese Sponsor: not declared Statistical methods: logistic regression Variables controlled in analysis: age, education, cigarette smoking and alcohol intake Variables controlled by matching: sex