Table 1.

Selected characteristics of study participants in relation to BMI at study enrollment

CharacteristicCategories of BMI (kg/m2) at enrollment
Age-adjusted RRs of endometrial cancer
<25 (n = 48,128)25-29.9 (n = 32,969)≥30 (n = 22,785)
Baseline BMI (kg/m2)22.327.235.0
Baseline age (y)
    <5511.910.312.61.0
    55-5923.623.225.11.36 (0.99-1.87)
    60-6428.429.729.31.59 (1.18-2.16)
    ≥6536.236.833.11.85 (1.37-2.48)
Age at menarche, % (y)
    <104.46.29.51.0
    11-1238.341.846.30.82 (0.61-1.10)
    ≥1357.352.044.20.65 (0.49-0.87)
Parity (%)
    017.916.317.51.0
    1-238.535.732.40.80 (0.66-0.99)
    ≥343.648.150.10.66 (0.54-0.81)
Age at menopause, % (y)
    <4411.712.212.91.0
    45-4928.127.026.11.30 (0.95-1.76)
    50-5450.249.948.81.59 (1.20-2.11)
    ≥5510.010.912.22.07 (1.50-2.87)
Menopausal hormone therapy (%)
    Never53.361.371.31.0
    Former8.38.67.41.00 (0.75-1.34)
    Current38.430.121.31.25 (1.06-1.48)
History of oral contraceptive use (%)
    Never59.061.665.61.0
    Ever41.038.434.40.71 (0.60-0.85)
  • NOTE: All values (except age) are standardized, using direct standardization, to the age distribution of the study population.