title: Green tea consumption and the risk of incident functional disability in elderly Japanese: the Ohsaki Cohort 2006 Study.
abstract: BACKGROUND
  Previous studies have reported that green tea consumption is associated with a lower risk of diseases that cause functional disability, such as stroke, cognitive impairment, and osteoporosis. Although it is expected that green tea consumption would lower the risk of incident functional disability, this has never been investigated directly.
  
  
  OBJECTIVE
  The objective was to determine the association between green tea consumption and incident functional disability in elderly individuals.
  
  
  METHODS
  We conducted a prospective cohort study in 13,988 Japanese individuals aged ≥65 y. Information on daily green tea consumption and other lifestyle factors was collected via questionnaire in 2006. Data on functional disability were retrieved from the public Long-term Care Insurance database, in which subjects were followed up for 3 y. We used Cox proportional hazards regression analysis to investigate the association between green tea consumption and functional disability.
  
  
  RESULTS
  The 3-y incidence of functional disability was 9.4% (1316 cases). The multiple-adjusted HR (95% CI) of incident functional disability was 0.90 (0.77, 1.06) among respondents who consumed 1-2 cups green tea/d, 0.75 (0.64, 0.88) for those who consumed 3-4 cups/d, and 0.67 (0.57, 0.79) for those who consumed ≥5 cups/d in comparison with those who consumed <1 cup/d (P-trend < 0.001).
  
  
  CONCLUSIONS
  Green tea consumption is significantly associated with a lower risk of incident functional disability, even after adjustment for possible confounding factors.
authors.affiliation: Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan. y-tomata@med.tohoku.ac.jp
authors.forename: Yasutake
authors.initials: Y
authors.lastname: Tomata
authors.forename: Masako
authors.initials: M
authors.lastname: Kakizaki
authors.forename: Naoki
authors.initials: N
authors.lastname: Nakaya
authors.forename: Toru
authors.initials: T
authors.lastname: Tsuboya
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Sone
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kuriyama
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hozawa
authors.forename: Ichiro
authors.initials: I
authors.lastname: Tsuji
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D001628:Beverages; D015992:Body Mass Index; D003072:Cognition Disorders / Q000453:epidemiology* / Q000517:prevention & control; D002149:Energy Intake; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008019:Life Style; D008297:Male; D010024:Osteoporosis / Q000453:epidemiology* / Q000517:prevention & control; D011446:Prospective Studies; D012307:Risk Factors; D020521:Stroke / Q000453:epidemiology* / Q000517:prevention & control; D011795:Surveys and Questionnaires; D013662:Tea / Q000737:chemistry*
chemical_list: D013662:Tea