Table 3.

Adjusted PMD and 95% CI according to intake levels of green tea and black tea separately

Green tea
Black tea
n (total = 2,361)*Mean (95% CI) PMD (%)n (total = 2,058)Mean (95% CI) PMD (%)
All subjects
    Non-tea drinkers1,56021.7 (20.9-22.5)1,56021.9 (21.1-22.7)
    Less than daily55419.2 (17.9-20.6)35621.0 (19.3-22.7)
    Daily24720.0 (18.0-22.1)14221.0 (18.3-23.8)
    Ptrend0.0080.358
    Non-tea drinkers1,56021.7 (20.9-22.5)1,56021.9 (21.1-22.7)
    Drinkers80119.5 (18.3-20.6)49821.0 (19.6-22.5)
    Ptrend0.0020.316
Premenopausal
    Non-tea drinkers13833.4 (30.5-36.4)13833.0 (29.9-36.0)
    Less than daily5230.5 (25.6-35.4)2834.0 (27.1-41.0)
    Daily2529.8 (22.8-36.7)1732.8 (23.9-41.7)
    Ptrend0.2820.914
    Non-tea drinkers13833.4 (30.5-36.4)13833.0 (30.0-36.0)
    Drinkers7730.3 (26.3-34.2)4533.6 (28.1-39.0)
    Ptrend0.3280.861
Postmenopausal
    Non-tea drinkers1,42220.6 (19.7-21.4)1,42220.8 (20.0-21.7)
    Less than daily50218.0 (16.6-19.4)32819.8 (18.0-21.5)
    Daily22219.1 (17.0-21.2)12520.0 (17.1-22.9)
    Ptrend0.0170.347
    Non-tea drinkers1,42220.6 (19.7-21.4)1,42220.8 (20.0-21.7)
    Drinkers72418.4 (17.2-19.5)45319.8 (18.3-21.3)
    Ptrend0.0030.289
  • NOTE: Adjusted for age at mammography, BMI at mammography (kg/m2), education (no formal education, primary school, secondary school, A level/university), menopausal status (pre, post in analysis for all subjects), parity (0,1-2, 3-4, ≥5), and total calories (kcal).

  • * 954 subjects who drank black tea were excluded from this analysis.

  • 1,257 subjects who drank green tea were excluded form this analysis.