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Table 2 Mean absolute change of percent density (PD) from baseline until first follow-up mammogram

From: Change of mammographic density predicts the risk of contralateral breast cancer - a case-control study

  N Meandecrease (%-units) 95% CI for mean decrease of PD P-value
Total 422 -3.94 -4.89, -3.00 -
CBC case/control status     0.09
Cases 211 -3.13 -4.39, -1.87  
Controls 211 -4.75 -6.16, -3.34  
Age at time of (first) cancer:     <0.01
<45 years 74 -5.30 -8.39, -2.22  
45 to 54 years 136 -5.85 -7.61, -4.10  
55 to 64 years 112 -4.13 -5.60, -2.65  
≥65 years 100 -0.13 -1.50, 1.25  
Calendar period of (first) cancer:     0.25
1976 to 1980 62 -4.11 -7.57, -0.66  
1981 to 1985 80 -3.78 -6.24, -0.32  
1986 to 1990 90 -2.27 -4.09, -0.46  
1991 to 1995 102 -3.91 -5.70, -2.12  
1996 to 2005 88 -5.71 -7.26, -4.16  
Total breast area at baseline:     0.27
Smallest quartile 103 -2.54 -4.66, -0.41  
2 nd quartile 105 -4.68 -6.71, -2.66  
3 rd quartile 110 -4.91 -6.75, -3.07  
Largest quartile 104 -3.56 -5.16, -1.96  
Adjuvant therapy of (first) cancer:     <0.01
No adjuvant therapy 78 -1.09 -3.09, 0.92  
Radiotherapy only 114 -3.22 -5.14, -1.30  
Endocrine therapy (with/without radiotherapy) 174 -4.15 -5.37, -2.93  
Chemotherapy (with/without other adjuvant therapy) 56 -8.74 -5.24, -12.24  
Menopause status at (first) cancer:*     <0.01
Premenopausal 173 -5.90 -7.70, -4.10  
Postmenopausal 243 -2.56 -3.54, -1.58  
Postmenopausal HRT use:*     <0.01
with Current use of HRT at diagnosis 51 -6.55 -8.90, -4.19  
with No current use of HRT at diagnosis 127 -1.66 -2.90, -0.43  
ER-status of (first) cancer:     0.63
ER-positive 295 -4.15 -5.29, -3.01  
ER-negative 53 -3.46 -5.92, -0.99  
TNM-stage of (first) cancer:*     0.67
1 244 -4.06 -5.27, -2.85  
2 157 -3.48 -5.10, -1.86  
3 16 -5.36 -11.19, 0.47  
  1. The mean change is calculated for cases and control combined.
  2. * Six (1%) women with unknown menopause; 65 (27%) postmenopausal women with unknown HRT. Five women with unknown TNM-stage.
  3. TNM, tumor-node-metastasis