Table IV.
Comparison of variables two groups of the low- and high-density of breast
| Variables | Low density (n░=░68) | High density (n░=░68) | P-value |
|---|---|---|---|
| Age* | |||
| < 45░yr ≥ 45░yr |
40 (58.8) 28 (41.2) |
38 (55.9) 30 (44.1) |
0.86 |
| BMI* | |||
| 18.5–24.99 25–29.99 ≥ 30 |
15 (22.1) 23 (33.8) 30 (44.1) |
22 (32.8) 32 (47.8) 13 (19.4) |
0.009 |
| Age of Menarche** | 13.56░±░2.49 | 13.78░±░1.75 | 0.55 |
| Age at first delivery** | 23.26░±░6.67 | 22.23░±░5.27 | 0.39 |
| WHR** | 0.87░±░0.07 | 0.84░±░0.09 | 0.07 |
| Regular menstruation* | 35 (51.5) | 33 (48.5) | 0.86 |
| Vitamin D consumption* | 14 (20.6) | 28 (41.2) | 0.02 |
| Calcium consumption* | 56 (82.4) | 59 (86.8) | 0.64 |
| The positive family history of breast surgery* | 8 (11.8) | 19 (27.9) | 0.03 |
| Daily sun exposure more than 30░min* | 10 (14.7) | 9 (13.2) | 1 |
| Exposure to cigarette smoke* | 15 (22.1) | 15 (22.1) | 1 |
| Physical activity* | 45 (66.2) | 37 (54.4) | 0.22 |
| History of breast feeding* | 50 (73.5) | 56 (82.4) | 0.30 |
| History of abortion* | 21 (30.9) | 17 (25) | 0.57 |
*
Data expressed as number (%);
**
Data expressed as mean░±░SD
P-value refers to t-test in comparison of continues variables and Chi-square test was conducted between categorical variables
BMI: Body mass index; WHR: Waist-hip ratio