Table 1.
Characteristics of the study population
Characteristic | Control subjects (N=47,591) | Case subjects (N=1,749)a | ||
---|---|---|---|---|
| ||||
mean | (SD) | mean | (SD) | |
Age at enrollment | 55.1 | (9.0) | 56.9 | (8.9) |
n | (%) | n | (%) | |
Race/Ethnicity | ||||
Non-Hispanic White | 40,750 | 83.5 | 1,528 | 86.4 |
Non-Hispanic Black | 4,318 | 8.9 | 113 | 6.4 |
Hispanic | 2,433 | 5.0 | 71 | 4.0 |
Other | 1,236 | 2.5 | 55 | 3.2 |
Unknown | 7 | 0.0 | 0 | 0.0 |
Education | ||||
Less than high school | 605 | 1.3 | 15 | 0.9 |
Completed high school | 6,882 | 14.2 | 245 | 13.9 |
Associate or technical degree | 16,473 | 33.9 | 545 | 30.8 |
Bachelor’s degree | 13,058 | 26.9 | 490 | 27.7 |
Graduate degree | 11,542 | 23.8 | 472 | 26.7 |
Unknown | 11 | 0.0 | 1 | 0.0 |
Body Mass Index | ||||
<18.5 | 568 | 1.2 | 17 | 0.9 |
18.5–24.9 | 18,171 | 37.4 | 639 | 36.1 |
25.0–29.9 | 15,334 | 31.6 | 571 | 32.3 |
30.0–39.9 | 12,101 | 24.9 | 450 | 25.5 |
≥ 40.0 | 2,375 | 4.9 | 91 | 5.2 |
Unknown | 17 | 0.0 | 0 | 0.0 |
Smoking | ||||
Never smoker | 26,183 | 53.9 | 920 | 52.0 |
Former smoker | 18,251 | 37.6 | 716 | 40.5 |
Current smoker | 4,070 | 8.4 | 131 | 7.4 |
Unknown | 67 | 0.1 | 1.0 | 0.1 |
Physical Activity (in Met-hours/week) | ||||
1st Quintile | 9,634 | 19.8 | 341 | 19.3 |
2nd Quintile | 9,627 | 19.8 | 360 | 20.4 |
3rd Quintile | 9,628 | 19.8 | 363 | 20.5 |
4th Quintile | 9,631 | 19.8 | 353 | 20.0 |
5th Quintile | 9,628 | 19.8 | 338 | 19.1 |
Unknown | 423 | 0.9 | 13 | 0.7 |
Hormone Replacement Therapy | ||||
No, has never taken | 43,396 | 89.4 | 1,523 | 86.1 |
Yes, is taking or took in the past | 4,962 | 10.2 | 238 | 13.5 |
Unknown | 213 | 0.4 | 7 | 0.4 |
. excluding in situ breast cancer cases