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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