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

	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%)