Table 1.

Characteristics of ovarian cancer cases and controls (n = 2,577), NECSS, Canada, 1994–1997

CharacteristicsCases (n = 442)Controls (n = 2,135)P
Age, y (mean ± SD)55.1 ± 12.355.2 ± 12.50.91
Education, y (mean ± SD)12.3 ± 3.312.2 ± 3.60.44
Alcohol consumption, drinks/wk (mean ± SD)2.2 ± 4.32.6 ± 5.40.16
Smoking pack-years (mean ± SD)8.4 ± 12.57.5 ± 12.80.15
BMI, kg/m2 (mean ± SD)26.3 ± 6.625.2 ± 5.20.0002
Total caloric intake, kcal/wk, quartiles (mean ± SD)13,127 ± 5,20112,769 ± 6,7880.19
Total recreational physical activity, frequency/wk, quartiles*22.5 ± 22.125.3 ± 22.80.016
Years of menstruation (mean ± SD)31.8 ± 8.031.8 ± 7.80.96
Menopause status (%)
    Premenopausal29.938.3
    Postmenopausal70.161.7
No. live births (%)
    024.115.1
    112.39.9
    228.229.0
    320.919.3
    ≥414.526.7
Marital status (%)
    Married67.267.3
    Common law2.73.2
    Divorced/separated11.39.3
    Widowed10.013.9
    Single8.65.9
    Other0.20.3
Family income adequacy (%)
    Low14.916.7
    Lower middle17.416.6
    Upper middle22.223.5
    High19.914.8
    Missing25.628.4
Smoking status (%)
    Never smoker46.850.8
    Ex-smoker33.529.0
    Current smoker19.720.1
Information collected in Ontario Province only
    First relative with cancer (%)
    No43.759.0
    Yes56.341.0
    First relative with breast cancer (%)
    No89.191.3
    Yes10.98.7
    Use oral contraceptive ≥6 mo (%)
    No55.053.1
    Yes45.046.9
  • * Composite index of total recreational physical activity.