Table 3 Frequency distribution of covariates among the study population according to case–control status among postmenopausal females, the Multiethnic Cohort
Total (N = 2940) | Controls (N = 1470) | Breast cancer cases | |
|---|---|---|---|
N (%) | N (%) | N (%) | |
Race and ethnicity | |||
African American | 440 (15.0%) | 220 (15.0%) | 220 (15.0%) |
Japanese American | 1034 (35.2%) | 517 (35.2%) | 517 (35.2%) |
Latino | 544 (18.5%) | 272 (18.5%) | 272 (18.5%) |
Native Hawaiian | 354 (12.0%) | 177 (12.0%) | 177 (12.0%) |
Non-Latino White | 568 (19.3%) | 284 (19.3%) | 284 (19.3%) |
HR status | |||
HR + (ER + or PR +) | 2410 (82.0%) | 1205 (82.0%) | 1205 (82.0%) |
HR− (ER− and PR− ) | 434 (14.8%) | 217 (14.8%) | 217 (14.8%) |
Lipid-lowering drug use | |||
No | 2070 (70.4%) | 1060 (72.1%) | 1010 (68.7%) |
Yes | 854 (29.0%) | 404 (27.5%) | 450 (30.6%) |
Age at blood draw, mean years (SD) | 66.4 (8.0) | 66.4 (7.9) | 66.3 (8.0) |
Education | |||
< = High school | 980 (33.3%) | 462 (31.4%) | 518 (35.2%) |
Some college | 939 (31.9%) | 470 (32.0%) | 469 (31.9%) |
College graduate | 493 (16.8%) | 254 (17.3%) | 239 (16.3%) |
Graduate school | 512 (17.4%) | 276 (18.8%) | 236 (16.1%) |
Missing | 16 (0.5%) | 8 (0.5%) | 8 (0.5%) |
Parity | |||
None | 351 (11.9%) | 152 (10.3%) | 199 (13.5%) |
1 child | 310 (10.5%) | 161 (11.0%) | 149 (10.1%) |
2–3 children | 1449 (49.3%) | 746 (50.7%) | 703 (47.8%) |
4 + children | 813 (27.7%) | 402 (27.3%) | 411 (28.0%) |
Missing | 17 (0.6%) | 9 (0.6%) | 8 (0.5%) |
BMI at blood draw, kg/m2 | |||
Underweight/normal | 1140 (38.8%) | 641 (43.6%) | 499 (33.9%) |
Overweight | 990 (33.7%) | 479 (32.6%) | 511 (34.8%) |
Obese | 796 (27.1%) | 347 (23.6%) | 449 (30.5%) |
Missing | 14 (0.5%) | 3 (0.2%) | 11 (0.7%) |
Smoking status at blood draw | |||
Never smoking | 1728 (58.8%) | 918 (62.4%) | 810 (55.1%) |
Former smoker | 1044 (35.5%) | 492 (33.5%) | 552 (37.6%) |
Current smoker | 165 (5.6%) | 57 (3.9%) | 108 (7.3%) |
Missing | 3 (0.1%) | 3 (0.2%) | 0 (0.0%) |