From: Genomic signature of parity in the breast of premenopausal women
Characteristics | Parous (n = 79) | Nulliparous (n = 30) | p value |
---|---|---|---|
Age at visit, years | 39.9 (30.1, 47.3) | 35.8 (30.1, 46.2) | 0.03 |
Number of FTP | |||
 1 | 13 (16%) |  |  |
 2 | 44 (46%) |  |  |
 3+ | 22 (28%) |  |  |
Time since last FTP, years | |||
 ≤ 5 | 30 (39%) |  |  |
 6–10 | 29 (37%) |  |  |
 > 10 | 20 (25%) |  |  |
Age at first FTP, years | 26 (18, 27) | Â | Â |
Phase of cycle/hormonal IUD1 | Â | Â | 0.05 |
 Luteal | 21 (28%) | 14 (52%) |  |
 Ovulatory | 10 (13%) | 4 (15%) |  |
 Follicular | 21 (28%) | 7 (26%) |  |
 Hormonal IUD | 23 (31%) | 2 (7%) |  |
 Missing | 4 | 3 |  |
OC ever use | 74 (94%) | 27 (90%) | 0.68 |
Breast density, BIRADS | |||
 1 | 10 (13%) | 4 (13%) | 0.38 |
 2 | 16 (20%) | 2 (7%) |  |
 3 | 10 (13%) | 4 (13%) |  |
 4 | 43 (54%) | 20 (67%) |  |
Age at menarche, years | 13.0 (11.0, 16.0) | 13.0 (11.0, 15.0) | 0.60 |
Family history of breast cancer | 7 (9%) | 2 (7%) | 0.99 |
Height, cm | 165.0 (148.0, 184.0) | 166.5 (157.0, 174.0) | 0.77 |
Weight, kg | 68.0 (41.0, 115.0) | 64.0 (46.0, 97.0) | 0.38 |
BMI | 24.2 (18.7, 38.0) | 23.4 (18.7, 37.1) | 0.24 |
Smoking | |||
 Never | 51 (64%) | 20 (67%) | 0.15 |
 Past | 23 (29%) | 5 (17%) |  |
 Current | 5 (6%) | 5 (17%) |  |
 Smoking duration, years | 8.0 (0.5, 20.0) | 17.0 (7.0, 30.0) | 0.006 |
 Years since quitting (past smokers) | 13.0 (0.1, 26.0) | 6.0 (1.0, 12.0) | 0.09 |