Table 3.
MGV and breast cancer risk factors in premenopausal and postmenopausal women.
| Cases Median (range) | Controls Median (range) | ||
|---|---|---|---|
| Premenopausal | Factors | n = 34 | n = 68 |
| Mammary gland volume (cm3) (IQR) | 108.0 (67.0–162.1)** | 68.7 (40.6–110.9) | |
| Age (years) | 49 (34–54) | 49 (34–56) | |
| BMI | 22.7 (16.0–39.8)** | 19.6 (15.2–38.0) | |
| Age at menarche (years) | 12 (11–13) | 12 (10–15) | |
| Number of deliveries (live births) | 1 (0–2)** | 2 (0–3) | |
| Age at first delivery (years) | 27 (23–36) | 28 (22–36) | |
| Breastfeeding duration (months) | 2 (0–12) | 1 (0–60) | |
| Positive family history (%)a§ | 14.7** | 1.5 | |
| Postmenopausal | Factors | n = 63 | n = 126 |
| Mammary gland volume (cm3) (IQR) | 53.0 (30.4–108.0)** | 34.2 (13.9–53.8) | |
| Age (years) | 58 (55–64) | 59 (55–52) | |
| BMI | 24.6 (16.6–40.7)** | 23.0 (19.3–35.6) | |
| Age at menarche (years) | 12 (10–14)** | 13 (10–15) | |
| Number of deliveries (live births) | 2 (0–3)** | 2 (0–3) | |
| Age at first delivery (years) | 25 (23–37) | 26 (23–33) | |
| Breastfeeding duration (months) | 3 (0–24) | 6 (0–40) | |
| Positive family history (%)a§ | 9.5* | 2.4 | |
| Age at menopause (years) | 50 (42–54) | 50 (45–56) |
Nonparametric test:
*
P < 0.05;
**
P < 0.01;
§, chi-square test.
Note:
a
Family history of breast cancer among first- and second-degree relatives.
Abbreviation: IQR, interquartile range.