Ohsaki National Health Insurance Cohort study

Introduction

Propective cohort study initiated in 1994 to investigate the association between green tea consumption and all-cause & cause- specific mortality.

Subjects: 40,530 Japanese adults age 40-79 years No history of CAD, stroke, cancer at start of study

Followup 11 years all-cause mortality, 1994-2005, 7 years, cause-specific mortality (1194-2001)

Results:

• green tea consuption was inversely associated with mortality due to all causes & due to cardiovascular disease
  • no mortality reduction due to cancer
• RR (relative to < 1 cup/day)
  • all-cause mortality
    • men: 1-2 cups 0.84, 0.69 3-4 cups, 0.88 > 5 cups
    • women: 1-2 cups 0.98, 0.82 3-4 cups, 0.77 > 5 cups
  • cardiovascular disase
    • women: 1-2 cups 0.84, 0.69 3-4 cups, 0.69 > 5 cups

More general terms

• cohort study

Additional terms

• Camellia sinensis (green & black tea)