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Table 3 Potential determinants for breast density and tumour detection

From: Breast density and mode of detection in relation to breast cancer specific survival: a cohort study

Factor Category Breast density  
   Fatty (n = 93) Moderate (n = 312) Dense (n = 214)  
   Number (column percent)Mean, SD in italics p-value**
Age at baseline Years 60.1 (7.1) 56.8 (6.8) 55.1 (6.7) <0.0001
Age at diagnosis Years 67.4 (7.3) 65.2 (7.1) 62.0 (7.6) < 0.0001
HRT at diagnosis No 25 (26.9) 126 (40.4) 46 (21.5) <0.0001
  Yes 10 (10.8) 84 (26.9) 106 (49.5)  
  Unknown 58 (62.4) 102 (32.6) 62 (29.0)  
Menopausal status at diagnosis Premenopausal 3 (3.2) 18 (5.8) 32 (15.0) 0.001
  Postmenopausal 89 (95.7) 287 (92.0) 177 (82.7)  
  Unknown 1 (1.1) 7 (2.2) 5 (2.3)  
BMI at baseline <20 0 (0.0) 10 (3.2) 17 (7.9) <0.0001
  20- < 25 29 (31.2) 135 (43.3) 129 (60.3)  
  25- < 30 27 (29.0) 123 (39.4) 53 (24.8)  
  ≥30 37 (39.8) 44 (14.1) 15 (7.0)  
Detection mode (three categories) Non-symptomatic 50 (53.8) 183 (58.7) 117 (54.7) 0.333
  Interval 10 (10.8) 43 (13.8) 34 (15.9)  
  Symptomatic 31 (33.3) 83 (26.6) 63 (29.4)  
  Unknown* 2 (2.2) 3 (1.0) 0 (0.0)  
Detection mode (symptomatic including interval cancers) Non-symptomatic 50 (53.8) 183 (58.7) 117 (54.7) 0.559
  Symptomatic 43 (46.2) 129 (41.3) 97 (45.3)  
  1. *Unknown if interval or symptomatic cancer.
  2. **Continuous variables analysed with ANOVA and categorical variables with the Chi-2 test.