Table 1. Basic characteristics of the control individuals and patients with breast cancer.
| Characteristic | Cases (N = 183) | Controls (N = 195) | P -value | |
|---|---|---|---|---|
| Mean age ± SD | 46.40 ± 9.383 (N= 183) | 45.35 ± 6.899 (N= 195) | 0.218a | |
| Mean BMI ± SD | 23.08 ± 3.00 (N= 183) | 22.53 ± 2.55 (N = 195) | 0.056a | |
| Menopause | Premenopausal | 115 (62.8%) | 119 (61.0%) | 0.716b |
| Postmenopausal | 68 (37.2%) | 76 (39.0%) | ||
| Age of Menarche | ≤ 12 | 25 (13.7%) | ||
| > 12 | 158 (86.3%) | |||
| Breastfeeding Duration | ≤ 6 | 12 (6.5%) | ||
| > 6 | 158 (93.5%) | |||
| Clinical Stages | I/II | 135 (73.8%) | ||
| III/IV | 48 (26.2%) | |||
| Estrogen Receptor | negative | 60 (32.8%) | ||
| positive | 123 (67.2%) | |||
| Family Tumor History | no | 156 (85.2%) | ||
| yes | 27 (14.8%) | |||
| Incipientw or Recurrence | Incipient | 109 (59.9%) | ||
| Recurrence | 73 (40.1%) | |||
| Lymph node metastasis | no | 105 (58.3%) | ||
| yes | 75 (41.7%) | |||
| Menopause | no | 115 (62.8%) | ||
| yes | 68 (37.2%) | |||
| Primiparous Age | < 30 | 170 (96.6%) | ||
| ≥ 30 | 6 (3.4%) | |||
| Procreative Times | < 1 | 142 (81.1%) | ||
| ≥ 1 | 33 (18.9%) | |||
| Progestrone Receptor | negative | 75 (41.0%) | ||
| positive | 108 (59.0%) | |||
| Tumor Location | left | 84 (45.9%) | ||
| right | 97 (53.0%) | |||
| both | 2 (1.1%) | |||
| Tumor Size (cm) | ≤ 3 | 94 (51.4%) | ||
| > 3 | 89 (48.6%) | |||
| Tumor Type | carcinoma | 165 (90.2%) | ||
| others | 18 (9.8%) | |||
| Whether fertility | no | 7 (3.8%) | ||
| yes | 176 (96.2%) |
SD: Standard deviation. BMI: Body mass index (weight [kg]/height[m]2).
a
P value was calculated by Welch's t test.
b
P value was calculated by Pearson's χ2 test.