Table 1.

Distribution of 989 breast cancer cases and 1,350 controls according to age, center, and selected covariates (Italy; 1991-1994)

CharacteristicsER- casesER+ casesControls
Center
    Pordenone154 (67.84)544 (71.39)918 (68.00)
    Forlì38 (16.74)108 (14.17)191 (14.15)
    Napoli35 (15.42)110 (14.44)241 (17.85)
    χ2 test, df (P)1.21, 2 (0.547)
Age group (y)
    <4559 (25.99)154 (20.21)289 (21.41)
    45-4928 (12.33)139 (18.24)169 (12.52)
    50-5444 (19.38)116 (15.22)213 (15.78)
    55-5932 (14.10)93 (12.20)203 (15.04)
    60-6428 (12.33)113 (14.83)177 (13.11)
    65-6924 (10.57)93 (12.20)189 (14.00)
    70-7412 (5.29)54 (7.09)110 (8.15)
    χ2 test, df (P)10.70, 6 (0.098)
Education (y)
    <529 (12.78)114 (14.96)306 (22.67)
    5-777 (33.92)292 (38.32)646 (47.85)
    8-1285 (37.44)237 (31.10)299 (22.15)
    ≥1336 (15.86)119 (15.62)99 (7.33)
    χ2 test, df (P)3.65, 3 (0.302)
Age at menarche (y)
    <13102 (44.93)315 (41.34)524 (38.81)
    13-1493 (40.97)321 (42.13)580 (42.96)
    >1432 (14.10)126 (16.54)246 (18.22)
    χ2 test, df (P)1.24, 2 (0.537)
Menopausal status
    Pre-/perimenopausal102 (44.93)333 (43.70)499 (36.96)
    Postmenopausal125 (55.07)429 (56.30)851 (63.04)
    χ2 test, df (P)0.11, 1 (0.743)
Parity (number of births)
    Nulliparae33 (14.54)111 (14.57)164 (12.15)
    1-2128 (56.39)467 (61.29)709 (52.52)
    ≥366 (29.07)184 (24.15)477 (35.33)
    χ2 test, df (P)2.38, 2 (0.305)
Family history of breast cancer
    Yes13 (5.73)72 (9.45)64 (4.74)
    No214 (94.27)690 (90.55)1,286 (95.26)
    χ2 test, df (P)3.08, 1 (0.079)
BMI
    <2250 (22.03)182 (23.98)264 (19.64)
    22 to <2571 (31.28)231 (30.43)407 (30.28)
    25 to <2847 (20.70)172 (22.66)314 (23.36)
    ≥2859 (25.99)174 (22.92)359 (26.71)
    χ2 test, df (P)1.32, 3 (0.724)
Energy intake (kcal/d)
    <1,93461 (26.87)235 (30.84)450 (33.33)
    1,934 to <2,44579 (34.80)258 (33.86)450 (33.33)
    ≥2,44587 (38.33)269 (35.30)450 (33.33)
    χ2 test, df (P)1.41, 2 (0.494)
  • NOTE: The sum may not add up to the total because of some missing values.