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Table 2 Baseline characteristics of postmenopausal NOWAC Study participants according to total coffee consumption

From: High coffee consumption and different brewing methods in relation to postmenopausal endometrial cancer risk in the Norwegian Women and Cancer Study: a population-based prospective study

Characteristics Average total coffee consumption, cups per day
  ≤ 1 2-3 4-7 ≥ 8
Number of women (%) 15795 (16.1) 32200 (32.9) 36992 (37.8) 12939 (13.2)
Number of EC cases (%) 82 (17.7) 171 (37.1) 177 (37.8) 32 (6.9)
Mean (sd)
Age at enrollment, years 47.5 (8.64) 48,7 (8.73) 47.9 (8.31) 43.7 (6.82)
Age at menarche, years 13.4 (1.45) 13.4 (1.37) 13.3 (1.36) 13.2 (1.39)
Age at first birth, years 24.8 (4.53) 24.4 (4.39) 23.6 (4.17) 22.7 (3.99)
Age at menopause, years 48.1 (5.03) 48.7 (8.74) 48.3 (4.66) 46.9 (4.95)
Duration of OC use, years 2.9 (4.56) 2.6 (4.29) 2.5 (4.12) 2.6 (4.01)
Number of children, %
    0 11.4 9.5 7.9 7.5
    1-2 55.4 53.9 52.6 53.5
    ≥ 3 33.2 36.6 39.5 39.0
Years of total education, %
    < 9 16.6 21.2 28.9 36.7
    10-12 30.2 33.3 36.3 38.3
    13-16 32.5 29.9 24.3 19.3
    > 17 20.8 15.6 10.5 5.9
Smoking status, %
    Current 17.7 21.8 39.3 61.8
    Former 31.1 35.6 31.9 24.6
    Never 51.2 42.6 28.8 13.7
BMI, %
    < 20 10.1 8.1 7.9 10.9
    20-24.9 56.8 58.1 56.7 57.6
    25-29.9 24.3 26.7 28.3 24.8
    ≥ 30 8.8 7.1 7.0 6.8
HRT use, %
    Never 79.7 79.9 83.3 91.1
    Former 8.7 8.4 7.1 3.3
    Current 11.6 11.7 9.7 5.6
Prevalence of diabetes, % 0.98 0.82 0.92 0.98
  1. Abbreviations: NOWAC Norwegian Women and Cancer, EC Endometrial cancer, SD Standard deviation, OC Oral contraceptives, BMI Body mass index, HRT Hormone replacement therapy.
  2. N = 97 926.