Table 1.

Distribution of selected characteristics among controls, ductal cases, and lobular cases

ControlsDuctal casesLobular cases
(n = 469)(n = 454)(n = 590)
Characteristicn (%)n (%)n (%)
Age, y
 55–59137 (29.2)126 (27.8)178 (30.2)
 60–64121 (25.8)109 (24.0)155 (26.3)
 65–69113 (24.1)117 (25.8)141 (23.9)
 70–7498 (20.9)102 (22.5)116 (19.7)
Race/ethnicity
 Non-Hispanic White423 (90.2)406 (89.6)546 (92.5)
 African American8 (1.7)10 (2.2)9 (1.5)
 Asian/Pacific Islander9 (1.9)16 (3.5)11 (1.9)
 Native American10 (2.1)11 (2.4)11 (1.9)
 Hispanic White19 (4.1)10 (2.2)13 (2.2)
 Missing010
Education
 High school or less150 (32.0)154 (33.9)188 (31.9)
 Some college182 (38.8)163 (35.9)198 (33.6)
 College graduates87 (18.6)88 (19.4)124 (21.0)
 Postgraduates50 (10.7)49 (10.8)80 (13.6)
Annual income
 <$20,00038 (9.6)54 (14.1)62 (12.5)
 $20,000–34,99976 (19.3)72 (18.8)106 (21.4)
 $35,000–69,999159 (40.4)136 (35.5)160 (32.3)
 $70,000–89,99947 (11.9)44 (11.5)78 (15.7)
 ≥$90,00074 (18.8)77 (20.1)90 (18.1)
 Missing757194
BMI at 30 years of age (kg/m2)
 <25.0378 (82.0)369 (81.8)504 (86.7)
 25.0–29.966 (14.3)68 (15.1)58 (10.0)
 ≥30.017 (3.7)14 (3.1)19 (3.3)
 Missing839
BMI 1 month before reference date (kg/m2)
 <25.0146 (31.2)158 (34.8)212 (36.1)
 25.0–29.9163 (34.8)144 (31.7)195 (33.2)
 ≥30159 (34.0)152 (33.5)180 (30.7)
 Missing103
Menopausal hormone therapy use
 Never118 (25.3)141 (31.2)125 (21.2)
 Former107 (23.0)70 (15.5)81 (13.8)
 Current estrogen only146 (31.3)110 (24.3)142 (24.1)
 Current estrogen + progestin95 (20.4)131 (29.0)241 (40.9)
 Missing321
First-degree family history of breast cancer
 No380 (84.3)334 (77.9)440 (76.5)
 Yes71 (15.7)95 (22.1)135 (23.5)
 Missing182515
Had a mammogram within the past 2 years
 No51 (10.9)37 (8.1)44 (7.5)
 Yes418 (89.1)417 (91.9)546 (92.5)
Menopausal status
 Natural266 (58.0)302 (67.7)391 (68.2)
 Induceda68 (14.8)49 (11.0)71 (12.4)
 Simple hysterectomy125 (27.2)95 (21.3)111 (19.4)
 Missing10817
Parous
 No36 (7.7)60 (13.2)81 (13.7)
 Yes433 (92.3)394 (86.8)509 (86.3)
  • aWomen who had bilateral oophorectomy were classified as having an induced menopause.