Table 1 Baseline characteristics of premenopausal and postmenopausal women. The characteristics of the women recruited in this study were investigated for both premenopausal and postmenopausal women separately
From: Impact of childbirth history on dense breast in mammographic screening: a cross-sectional study
|  | Premenopausal women (n = 7612) | Postmenopausal women (n = 9252) |
|---|---|---|
Age mean (SD) | 44.58 (5.54) | 61.51 (8.37) |
BMI mean (SD) | 21.34 (3.26) | 21.65 (3.42) |
Parity | ||
 0 | 3878 (50.9%) | 3279 (35.4%) |
 1 | 1604 (21.1%) | 1548 (16.7%) |
 2 | 1800 (23.6%) | 3309 (35.8%) |
 ≥ 3 | 330 (4.3%) | 1116 (12.0%) |
Smoking status | ||
 Never | 6191 (81.3%) | 7685 (83.1%) |
 Past | 1054 (13.8%) | 1245 (13.5%) |
 Current | 367 (4.8%) | 322 (3.5%) |
Alcohol status | ||
 None | 3505 (46.0%) | 5305 (57.3%) |
 Occasional | 1184 (15.6%) | 1237 (13.4%) |
 Regular | 2923 (38.4%) | 2710 (29.3%) |
Family history of breast cancer | 1487 (19.5%) | 1605 (17.3%) |
Hormonal therapy | 1091 (14.3%) | 1301 (14.1%) |
Breast density | ||
 Almost entirely fatty dense | 122 (1.6%) | 615 (6.6%) |
 Scattered fibroglandular dense | 3168 (41.6%) | 6039 (65.3%) |
 Heterogeneously dense | 4129 (54.2%) | 2530 (27.3%) |
 Extremely dense | 193 (2.5%) | 68 (0.7%) |