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Table 1 Demographic characteristics of the breast cancer patients

From: ESR1gene promoter region methylation in free circulating DNA and its correlation with estrogen receptor protein expression in tumor tissue in breast cancer patients

Characteristic   Cases SD
N = 110
Mean age; years (range)   58 (32–88) 12.4
Mean age at menarche; years (range)   13 (10–17) 1.4
Mean age at menopause; years (range)   49 (39–59) 3.8
Menopausal status    
  Pre-menopause 30.8%  
  Post-menopause 69.2%  
Mean age at first live birth; years (range)   25 (18–41) 3.9
Mean age at last live birth; years (range)   32 (20–42) 5.2
Breastfeeding    
  Yes 82 (76.6%)  
  No 23 (21.5%)  
Breastfeeding; months (range)   6 (1–36) 5.1
  1. SD: standard deviation.