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Table 1 Characteristics of 64 women in the study

From: Tissue-based associations of mammographic breast density with breast stem cell markers

Characteristic Mean (STD) or number (percentage)
Age at mammogram (continuous, years) 51.1 (9.6)
Body mass index (continuous, kg/m2) 27.0 (4.7)
Parity and age at first child’s birth
 Nulliparous 10 (16%)
 1–4 children with age at first birth ≤ 24 years 24 (38%)
 1–4 children with age at first birth of 25–29 years 13 (20%)
 1–4 children with age at first birth of ≥ 30 years 15 (23%)
  ≥ 5 children with age at first birth of < 25 years 0 (0%)
  ≥ 5 children with age at first birth of ≥ 25 years 2 (3%)
Menopausal status
 Premenopausal 22 (34%)
 Postmenopausal 42 (66%)
Postmenopausal hormone use
 Never 28 (67%)
 Past 13 (31%)
 Current 0 (0%)
 Unknown 1 (2%)
Family history of breast or ovarian cancer in first-degree relativesa 26 (43%)
  1. STD standard deviation
  2. aData were missing for 4 women