วัสดุและวิธีการศึกษาออกแบบและผู้เรียนA case-control design was used to investigate the association between tea consumption and ovarian cancer. Recruitment of cases focused on epithelial ovarian cancer that accounts for >90% of all of the ovarian malignancies (13) . Two hundred and fifty five hospital patients with epithelial carcinoma of the ovary were identified in Hangzhou, China, between July 1999 and June 2000. To ascertain cases, all of the relevant hospital and laboratory pathology reports were reviewed. Pathological diagnoses were based on the International Histological Classification of Ovarian Tumors recommended by the Fédération Internationale des Gynaecologistes et Obstetristes (13 , 14) . With the exception of 1 patient lost after discharge, all of the eligible cases were recruited during the period of data collection. Inclusion criteria for cases were defined to be women <75 years of age, who were residents (at least 10 years living in Zhejiang province) diagnosed with epithelial ovarian cancer and confirmed histopathologically within the past 3 years. Most patients were identified in the Women’s Hospital, School of Medicine, Zhejiang University (168 cases, 66%) and Zhejiang Cancer Hospital (53 cases, 21%). The remaining 13% were identified in 9 other general hospitals, but their pathological diagnoses had been reviewed and confirmed by pathologists of the former 2 hospitals. There was no significant difference in pathological diagnosis (serous cell versus other types) between the 2 teaching hospitals and the 9 community hospitals. Both Women’s Hospital and Zhejiang Cancer Hospital are public teaching hospitals with >500 beds and receive patients from all over the province. In 1999, there were ∼12,000 inpatients with 8,000 operations performed and 450,000 outpatients at the Women’s Hospital (15) . All of the hospitals are located in Hangzhou, the capital city of Zhejiang province. Most of the cases (75.2%) were recent patients interviewed within 12 months from diagnosis. Details of cases recruited are provided in Table 1⇓ .
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