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Table 1 Descriptive characteristics of the study subjects

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)   
Phase of cycle/hormonal IUD1    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
  1. 1p value for IUD/ no IUD = 0.01; excluding women having an IUD, there was no statistically significant difference in phase of menstrual cycle between P and NP