Table 1.
Demographic characteristics of the study population by statin use
| Characteristics | Statin User (N=6,836) | Non-User (N=85,952) | p value* | ||
|---|---|---|---|---|---|
| Age in years, mean (SD) | 61.4 | (8.7) | 59.7 | (11.0) | <0.0001 |
| Body mass index in kg/m2, mean (SD) | 27.9 | (6.1) | 25.9 | (5.7) | <0.0001 |
| n | (%) | n | (%) | ||
| Race | <0.0001 | ||||
| White | 5,325 | (89.3) | 48,614 | (87.6) | |
| African American | 192 | (3.2) | 1,583 | (2.9) | |
| Asian/Pacific Islander | 316 | (5.3) | 3,928 | (7.1) | |
| Other | 128 | (2.1) | 1,366 | (2.5) | |
| No information | 875 | 30,461 | |||
| Education | <0.0001 | ||||
| Below high school | 740 | (12.9) | 4,660 | (9.3) | |
| High school/GED | 1,920 | (33.5) | 14,023 | (27.9) | |
| Some college | 1,932 | (33.8) | 17,481 | (34.8) | |
| College graduate | 563 | (9.8) | 6,796 | (13.5) | |
| Graduate school | 568 | (9.9) | 7,263 | (14.5) | |
| No information | 1,113 | 35,729 | |||
| Family history of breast cancer (1st or 2nd degree relatives) | 0.79 | ||||
| No | 4,790 | (74.3) | 54,004 | (74.4) | |
| Yes | 1,660 | (25.7) | 18,566 | (25.6) | |
| No information | 386 | 13,382 | |||
| Parous | <0.0001 | ||||
| No | 609 | (9.4) | 9,217 | (12.6) | |
| Yes | 5,882 | (90.6) | 63,981 | (87.4) | |
| No information | 345 | 12,754 | |||
| Diabetes | <0.0001 | ||||
| No | 4,397 | (64.3) | 78,372 | (91.2) | |
| Yes | 2,439 | (35.7) | 7,580 | (8.8) | |
| Hormone therapy use | <0.0001 | ||||
| Never | 3,137 | (45.9) | 49,170 | (57.2) | |
| Estrogen only | 1,709 | (25.0) | 16,126 | (18.8) | |
| Estrogen plus progestin | 1,990 | (29.1) | 20,656 | (24.0) | |
| Menopausal status | <0.0001 | ||||
| Pre-menopausal | 29 | (0.4) | 3,655 | (4.4) | |
| Peri or Post-menopausal | 6,793 | (99.6) | 78,532 | (95.6) | |
| No information | 14 | 3,765 | |||
| Other lipid lowering agents use | <0.0001 | ||||
| Never | 5,070 | (74.2) | 83,682 | (97.4) | |
| Ever | 1,766 | (25.8) | 2,270 | (2.6) | |
*
Chi square test for categorical variables or t-test for continuous variables