title: The Impact of Green Tea Consumption on the Prevention of Hemorrhagic Stroke.
abstract: BACKGROUND
  Different types of tea may have varying effects on the risk of hemorrhagic stroke, but previous studies have generated inconsistent results. We performed a nationwide, multi-center, case-control study to evaluate the association between the consumption of tea and the risk of hemorrhagic stroke.
  
  
  METHODS
  This study included 940 patients aged 30 to 84 with non-traumatic acute hemorrhagic stroke who did not have a history of stroke or hemorrhage-prone brain lesions, as well as 940 community controls and 940 hospital controls matched to each patient by age and gender. Pre-trained interviewers obtained information on potential confounders. Consumption of tea was assessed by using a food frequency questionnaire. Participants were asked to indicate the number of cups of tea (green, black, and oolong tea) they consumed per day or per week during the preceding year.
  
  
  RESULTS
  The adjusted odds ratios (ORs) and their 95% confidence intervals (CIs) were calculated by conditional logistic regression. The adjusted ORs of hemorrhagic stroke were 0.71 (95% CI: 0.59-0.87), 0.86 (95% CI: 0.55-1.37), and 1.34 (95% CI: 0.91-1.98) for consumption of green, oolong, and black tea, respectively, compared with no consumption. There was no significant linear trend for green tea consumption.
  
  
  CONCLUSIONS
  Consumption of green tea may protect against hemorrhagic stroke, whereas consumption of black tea may have no meaningful effect on risk.
authors.affiliation: Chung-Ang University College of Pharmacy, Seoul, Republic of Korea.
authors.forename: Seung-Mi
authors.initials: SM
authors.lastname: Lee
authors.forename: Nam-Kyong
authors.initials: NK
authors.lastname: Choi
authors.forename: Byung-Woo
authors.initials: BW
authors.lastname: Yoon
authors.forename: Jong-Moo
authors.initials: JM
authors.lastname: Park
authors.forename: Moon-Ku
authors.initials: MK
authors.lastname: Han
authors.forename: Byung-Joo
authors.initials: BJ
authors.lastname: Park
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D020300:Intracranial Hemorrhages / Q000517:prevention & control*; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D020521:Stroke / Q000517:prevention & control*; D013662:Tea
chemical_list: D013662:Tea