Table 1 Baseline characteristics of the participants by breast cancer incidence during follow-up
From: Cardiovascular risk factors and breast cancer incidence in a large middle-aged cohort study
| Â | Total | Breast Cancer | Non-Breast Cancer | Â |
|---|---|---|---|---|
|  | N = 7501 | N = 576 | N = 6925 | P-Value |
Mean(SD) | Â | Â | Â | Â |
 Age | 53.9 (5.7) | 54.3 (5.8) | 53.8 (5.7) | 0.06 |
 BMI (kg/m2) | 27.9 (6.2) | 28.0 (6.2) | 27.9 (6.3) | 0.61 |
 Waist-to-hip ratio | 0.9 (0.1) | 0.9 (0.1) | 0.9 (0.1) | 0.75 |
 Blood glucose level (mmol/L) | 6.0 (2.5) | 6.0 (2.3) | 5.9 (2.5) | 0.61 |
 TC (mmol/L) | 5.5 (1.4) | 5.6 (1.2) | 5.5 (1.4) | 0.57 |
 HDL (mmol/L) | 1.5 (0.5) | 1.5 (0.5) | 1.5 (0.5) | 0.95 |
 LDL (mmol/L) | 3.4 (1.2) | 3.5 (1.1) | 3.4 (1.2) | 0.47 |
 TG (mmol/L) | 1.4 (0.9) | 1.4 (0.7) | 1.4 (1.0) | 0.88 |
 ApoA1(g/L) | 1.4 (0.4) | 1.4 (0.4) | 1.4 (0.4) | 0.47 |
 ApoB (g/L) | 0.9 (0.3) | 0.9 (0.3) | 0.9 (0.3) | 0.32 |
No. of subjects (%) | Â | Â | Â | Â |
Race/Ethnicity | Â | Â | Â | 0.01* |
 White | 5258 | 430 (74.7%) | 4828 (69.7%) | |
 Black | 2243 | 146 (25.3%) | 2097 (30.3%) | |
Smoking habit | Â | Â | Â | 0.60 |
 Never | 3973 | 305 (53.0%) | 3668 (53.0%) | |
 Ever | 1667 | 136 (23.6%) | 1531 (22.1%) | |
 Current | 1861 | 135 (23.4%) | 1726 (24.9%) | |
Alcohol consumption | Â | Â | Â | 0.62 |
 Never | 2677 | 207 (35.9%) | 2470 (35.7%) | |
 Ever | 1199 | 84 (14.6%) | 1115 (16.1%) | |
 Current | 3625 | 285 (49.5%) | 3340 (48.2%) | |
Hypertension | Â | Â | Â | 0.68 |
 Yes | 2675 | 210 (36.5%) | 2465 (35.6%) | |
 No | 4826 | 366 (63.5%) | 4460 (64.4%) | |
 Diabetes |  |  |  | 0.88 |
 Yes | 769 | 58 (10.1%) | 711 (10.3%) | |
 No | 6732 | 518 (89.9%) | 6214 (89.7%) | |
 Hypercholesterolemia |  |  |  | 0.75 |
 Yes | 3261 | 254 (44.1%) | 3007 (43.4%) | |
 No | 4240 | 322 (55.9%) | 3918 (56.6%) | |
Healthy diet score | Â | Â | Â | 0.86 |
 Non-poor | 6284 | 481 (83.5%) | 5803 (83.8%) | |
 Poor | 1217 | 95 (16.5%) | 1122 (16.2%) | |
Physical activity | Â | Â | Â | 0.67 |
 Non-poor | 4399 | 333 (57.8%) | 4066 (58.7%) | |
 Poor | 3102 | 243 (42.2%) | 2859 (41.3%) | |
Menopausal status | Â | Â | Â | 0.38 |
 Premenopause | 2121 | 172 (29.9%) | 1949 (28.1%) | |
 Postmenopause | 5380 | 404 (70.1%) | 4976 (71.9%) | |
Education level | Â | Â | Â | 0.61 |
 Below High school | 1793 | 137 (23.8%) | 1656 (23.9%) | |
 High school/graduate school | 3340 | 247 (42.9%) | 3093 (44.7%) | |
 College/graduate/professional school | 2368 | 192 (33.3%) | 2176 (31.4%) | |
Income (US$/Year) | Â | Â | Â | 0.53 |
  < 16,000 | 2017 | 150 (26.0%) | 1867 (27.0%) | |
  ≥ 16,000 to < 25,000 | 1145 | 99 (17.2%) | 1046 (15.1%) | |
  ≥ 25,000 to < 35,000 | 1665 | 116 (20.1%) | 1549 (22.4%) | |
  ≥ 35,000 to < 50,000 | 1210 | 98 (17.1%) | 1112 (16.0%) | |
  ≥ 50,000 | 1464 | 113 (19.6%) | 1351 (19.5%) |