Table 1.

Descriptive characteristics of MAMS control study population, Pittsburgh, PA 2001-2005 (n = 728)

CharacteristicBenign (n = 224), n (%)Well (n = 504), n (%)P
Age, y*54.2 (9.1)58.7 (9.9)<0.0001
Age, y
    <5078 (34.8)88 (17.5)<0.0001
    50-5977 (34.4)201 (39.9)
    60-6957 (25.5)136 (27.0)
    ≥7012 (5.4)79 (15.7)
BMI, kg/m2*27.7 (6.3)28.8 (7.1)0.04
BMI, kg/m2
    Normal, <2583 (37.1)168 (33.3)0.19
    Overweight, 25 to <3076 (33.9)162 (32.1)
    Obese, ≥3064 (28.6)174 (34.5)
Race/ethnicity
    White211 (94.2)474 (94.1)0.94
    Other13 (5.8)30 (6.0)
Education
    ≤High school60 (26.8)111 (22.0)0.16
    Post-secondary education164 (73.2)393 (78.0)
Smoking status
    Never125 (55.8)302 (59.9)0.002
    Former66 (29.5)169 (33.5)
    Current33 (14.7)33 (6.6)
Alcohol intake in year before enrollment
    No regular consumption161 (71.9)364 (72.2)0.05
    <12 g/d30 (13.4)84 (16.7)
    ≥12 g/d21 (9.4)47 (9.0)
Current alcohol drinker
    No161 (71.9)364 (72.2)0.05
    Yes52 (23.2)131 (26.0)
Hormone therapy use status
    Never98 (43.8)238 (47.2)<0.0001
    Former50 (22.3)207 (41.1)
    Current76 (33.9)59 (11.7)
Age at menarche, y
    <1244 (19.6)98 (19.4)0.01
    1252 (23.2)156 (31.0)
    1391 (40.6)142 (28.2)
    ≥1437 (16.5)107 (21.2)
Menopausal status
    Premenopausal76 (33.9)104 (20.6)0.0001
    Postmenopausal148 (66.1)400 (79.4)
Age at menopause, y
    Premenopausal76 (33.9)104 (20.6)0.0001
    <4013 (5.8)24 (4.8)
    40-4421 (9.4)50 (9.9)
    45-4951 (22.8)94 (18.7)
    50-5451 (22.8)201 (39.9)
    ≥557 (3.13)23 (4.6)
No. live births
    None43 (19.2)104 (20.6)0.61
    126 (11.6)64 (12.7)
    279 (35.3)161 (31.9)
    350 (22.3)99 (19.6)
    ≥426 (11.6)76 (15.1)
Age at first pregnancy lasting over 6 mo
    No live births/pregnancy lasted <6 mo43 (19.2)105 (20.8)0.49
    <2024 (10.7)42 (8.3)
    20-2470 (31.3)151 (30.0)
    25-2959 (26.3)117 (23.2)
    ≥3027 (12.1)86 (17.1)
History of breast-feeding
    Not applicable43 (19.2)105 (20.8)0.47
    No82 (36.6)178 (35.3)
    Yes98 (43.8)221 (43.9)
First-degree relative with breast cancer
    No181 (80.8)423 (83.9)0.25
    Yes43 (19.2)78 (15.5)
Ever had previous breast biopsy
    No140 (62.5)440 (87.3)<0.0001
    Yes83 (37.1)64 (12.7)
No. previous breast biopsies
    None141 (63.0)440 (87.3)<0.0001
    153 (23.7)45 (8.9)
    ≥228 (12.5)18 (3.6)
  • NOTE: Percentages may not sum to 100% due to rounding or missing data.

  • * Reported as mean (SD).