Table 1.

Demographic characteristics of the study population by statin use

CharacteristicsStatin user (N = 6,836), n (%)Nonuser (N = 85,952), n (%)P*
Age (y), mean (SD)61.4 (8.7)59.7 (11.0)<0.0001
Body mass index (kg/m2), mean (SD)27.9 (6.1)25.9 (5.7)<0.0001
Race<0.0001
    White5,325 (89.3)48,614 (87.6)
    African American192 (3.2)1,583 (2.9)
    Asian/Pacific Islander316 (5.3)3,928 (7.1)
    Other128 (2.1)1,366 (2.5)
    No information87530,461
Education<0.0001
    Below high school740 (12.9)4,660 (9.3)
    High school/GED1,920 (33.5)14,023 (27.9)
    Some college1,932 (33.8)17,481 (34.8)
    College graduate563 (9.8)6,796 (13.5)
    Graduate school568 (9.9)7,263 (14.5)
    No information1,11335,729
Family history of breast cancer (first- or second-degree relatives)0.79
    No4,790 (74.3)54,004 (74.4)
    Yes1,660 (25.7)18,566 (25.6)
    No information38613,382
Parous<0.0001
    No609 (9.4)9,217 (12.6)
    Yes5,882 (90.6)63,981 (87.4)
    No information34512,754
Diabetes<0.0001
    No4,397 (64.3)78,372 (91.2)
    Yes2,439 (35.7)7,580 (8.8)
Hormone therapy use<0.0001
    Never3,137 (45.9)49,170 (57.2)
    Estrogen only1,709 (25.0)16,126 (18.8)
    Estrogen plus progestin1,990 (29.1)20,656 (24.0)
Menopausal status<0.0001
    Premenopausal29 (0.4)3,655 (4.4)
    Perimenopausal or Postmenopausal6,793 (99.6)78,532 (95.6)
    No information143,765
Other lipid-lowering agents use<0.0001
    Never5,070 (74.2)83,682 (97.4)
    Ever1,766 (25.8)2,270 (2.6)
  • * χ2 test for categorical variables or t test for continuous variables.