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Table 1 Breast cancer risk factors by density measurs (quintiles* in controls (N = 859)

From: Mammographic density and breast cancer risk: the role of the fat surrounding the fibroglandular tissue

  Absolute dense area Absolute non-dense area
  Q1 Q2 Q3 Q4 Q5   Q1 Q2 Q3 Q4 Q5  
  (172) (172) (171) (172) (172)   (172) (171) (172) (173) (171)  
  Mean (sd) P-trend Mean (sd) P-trend
Age at examination (years) 60.3 (5.3) 60.6 (5.5) 59.1 (5.4) 58.8 (5.7) 56.7 (5.3) <0.001 57.2 (5.1) 57.8 (5.3) 59.7 (5.4) 59.8 (5.5) 60.9 (5.6) <0.001
BMI (kg/m2) 27.7 (4.1) 26.4 (4.0) 25.6 (3.5) 25.3 (3.7) 25.1 (3.9) <0.001 22.9 (2.4) 24.4 (2.5) 25.9 (2.8) 26.9 (3.3) 30.0 (4.4) <0.001
Height (cm) 163.4 (5.8) 163.8 (7.2) 164.1 (6.3) 164.4 (6.7) 165.0 (5.5) 0.02 164.7 (5.8) 164.3 (6.5) 163.6 (5.9) 164.0 (6.8) 164.0 (6.5) 0.20
Age at menarche(years) 13.4 (1.6) 13.5 (1.7) 13.3 (1.5) 13.5 (1.7) 13.3 (1.5) 0.72 13.6 (1.5) 13.4 (1.7) 13.4 (1.6) 13.2 (1.6) 13.3 (1.6) 0.05
Age at menopause (years) 47.1 (6.1) 47.9 (5.5) 47.1 (5.6) 48.0 (5.5) 46.9 (5.9) 0.87 47.8 (4.9) 47.4 (6.1) 47.2 (5.9) 47.1 (5.9) 47.5 (5.7) 0.45
Nr. of children 2.9 (1.4) 2.6 (1.6) 2.5 (1.5) 2.3 (134) 2.1 (1.4) <0.001 2.1 (1.3) 2.3 (1.5) 2.6 (1.4) 2.7 (1.6) 2.8 (1.5) <0.001
Age at first delivery (years) 25.0 (4.0) 25.4 (4.5) 24.8 (3.8) 25.2 (3.7) 24.9 (4.1) 0.87 25.4 (3.6) 24.9 (3.9) 24.7 (3.8) 25.4 (4.5) 25.0 (4.3) 0.79
  N (%)   N (%)  
Nulliparous 9 (5.2) 16 (9.3) 20 (11.7) 23 (13.4) 33 (19.2) <0.001 32 (18.6) 23 (13.5) 17 (9.9) 16 (9.2) 13 (7.6) 0.001
HT use (ever) 32 (18.6) 40 (23.3) 39 (22.8) 56 (32.7) 50 (29.1) <0.01 50 (29.2) 48 (28.1) 41 (23.8) 39 (22.5) 39 (22.8) 0.08
Pill use (ever) 106 (61.6) 117 (68.4) 107 (62.6) 112 (65.1) 109 (63.4) 0.99 112 (65.1) 107 (62.6) 115 (66.9) 110 (63.6) 107 (62.9) 0.77
Family history of breast cancer 28 (16.7) 20 (12.0) 27 (16.0) 23 (14.0) 26 (15.6) 0.99 29 (17.4) 25 (14.8) 21 (12.4) 20 (12.0) 29 (17.7) 0.80
  1. * Quintiles by controls only
  2. Parous women only
  3. The median nr. of children is shown in this table
  4. Bold p-trends are statistically significant