Table 2.

RRs and 95% CIs of CRC associated with green tea consumption, the Shanghai Women's Health Study, 1996 to 2004

All subjects
Analysis omitting the 1st year of observation
Person-yearsEvents, nAge-adjusted RR (95% CI)Multivariate RR* (95% CI)Events, nMultivariate RR* (95% CI)
Drinking green tea regularly
    No278,5292121.0 (reference)1.0 (reference)1891.0 (reference)
    Yes119,312440.58 (0.42-0.81)0.63 (0.45-0.88)360.57 (0.40-0.83)
Amount of dry green tea consumed (g/d),
    1-473,604300.64 (0.44-0.94)0.70 (0.47-1.02)250.64 (0.42-0.98)
    ≥541,260130.51 (0.29-0.89)0.56 (0.32-0.98)100.48 (0.25-0.92)
    Ptrend0.0020.010.004
Years of green tea consumption,§
    1-2384,801310.67 (0.46-0.98)0.72 (0.49-1.06)250.65 (0.42-1.00)
    ≥2430,268120.46 (0.26-0.82)0.50 (0.27-0.89)100.46 (0.24-0.87)
    Ptrend0.0010.0060.003
  • * Adjusted for age; education; household income; cigarette smoking; alcohol drinking; physical activity; body mass index; menopausal status; nonsteroidal anti-inflammatory drug use; vitamin supplement use; prior histories of colorectal polyps and chronic ulcerative colitis; family history of colorectal cancer; and intakes of total energy, vegetables, fruits, and red meat.

  • Data on the amount of tea consumed were missing for 798 participants.

  • Among tea drinkers, cutoff points for the amount and the years of tea consumption at the 75th percentiles.

  • § Data on years of tea consumption were missing for 720 participants.