Table 1.
Distribution of study characteristics by breast cancer status
| Variables | Cases (n=97) n (%) | Controls (n=102) n (%) | P* |
|---|---|---|---|
| Age, years | 57.63 ± 13.22 | 52.42 ± 9.93 | .002 |
| BMI, kg/m2 | .213 | ||
| <25 | 10 (10.3) | 18 (17.8) | |
| 25–29 | 34 (35.1) | 27 (26.7) | |
| ≥30 | 53 (54.6) | 56 (55.5) | |
| Waist-to-hip ratio | .253 | ||
| <.80 | 13 (14.0) | 17 (17.9) | |
| .80–.99 | 78 (83.9) | 72 (75.8) | |
| ≥1.00 | 2 (2.2) | 6 (6.3) | |
| Education level | .350 | ||
| <High school | 10 (10.3) | 15 (14.7) | |
| ≥ High school | 87 (89.7) | 87 (85.3) | |
| Marital status | .003 | ||
| Single/never married | 14 (14.4) | 32 (31.4) | |
| Married | 41 (42.3) | 23 (22.5) | |
| Divorced, separated or widowed | 42 (43.3) | 47 (46.1) | |
| Income | .434 | ||
| <$30,000 | 38 (40.4) | 46 (46.0) | |
| ≥ $30,000 | 56 (59.6) | 54 (54.0) | |
| Age at menarche (yrs) | .616 | ||
| ≤12 | 46 (47.4) | 52 (51.0) | |
| >12 | 51 (52.6) | 50 (49.0) | |
| Age at 1st full-term birth (yrs) | .289 | ||
| No births | 10 (10.3) | 15 (14.7) | |
| <20 | 40 (41.2) | 50 (49.0) | |
| 20–24 | 23 (23.7) | 15 (14.7) | |
| ≥25 | 24 (24.7) | 22 (21.6) | |
| Family history of breast cancer | .287 | ||
| No | 68 (70.8) | 79 (77.5) | |
| Yes | 28 (29.2) | 23 (22.5) | |
| Menopausal status | .084 | ||
| Premenopausal | 20 (20.6) | 32 (31.4) | |
| Postmenopausal | 77 (79.4) | 70 (68.6) | |
| Smoking history | .083 | ||
| Never | 62 (63.9) | 54 (52.9) | |
| Current | 8 (8.2) | 19 (18.6) | |
| Former | 27 (27.8) | 29 (28.4) | |
| Alcohol history | .093 | ||
| Never | 67 (69.1) | 56 (54.9) | |
| Current | 15 (15.5) | 27 (26.5) | |
| Former | 15 (15.5) | 19 (18.6) | |
| Walking for exercise, hrs/day | .751 | ||
| None | 26 (26.8) | 24 (23.5) | |
| <2 | 52 (53.6) | 54 (52.9) | |
| >2 | 19 (19.6) | 24 (23.5) | |
| Vigorous physical activity, hrs/wk | .010 | ||
| None | 59 (60.8) | 40 (39.2) | |
| >2 | 12 (12.4) | 19 (18.6) | |
| ≤2 | 26 (26.8) | 43 (42.2) | |
| Total activity (tertiles) | .018 | ||
| <15.75 | 36 (37.1) | 27 (26.5) | |
| 15.75–40.24 | 35 (36.1) | 28 (27.5) | |
| ≥40.25 | 26 (26.8) | 47 (46.1) |
Age is presented as mean ± SD.
*
P (two-sided) were from t test (for continuous variables) and x2 test (for categorical variables).