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Table 1 Characteristics of the study sample

From: An assessment of existing models for individualized breast cancer risk estimation in a screening program in Spain

   No cancer(1)(N = 13380) Cancer (N = 329) Total (N = 13709)  
   N % N % N % p-value(3)
Age at first mammogram, y 50-54 4975 37.18 120 36.47 5095 37.17 0.026
55-59 3602 26.92 110 33.43 3712 27.08  
60-64 4216 31.51 83 25.23 4299 31.36  
65-69 587 4.39 16 4.86 603 4.40  
Age at menarche, y <12 2493 18.63 62 18.84 2555 18.64 0.990
12-13 5243 39.19 129 39.21 5372 39.19  
> = 14 5505 41.14 134 40.73 5639 41.13  
Unknown 139 1.04 4 1.22 143 1.04  
Age at first live birth, y <20 1065 7.96 26 7.90 1091 7.96 0.050
20-24 6242 46.65 151 45.90 6393 46.63  
25-29 4109 30.71 91 27.66 4200 30.64  
>29 966 7.22 37 11.25 1003 7.32  
No children 902 6.74 23 6.99 925 6.75  
Unknown 96 0.72 1 0.30 97 0.71  
Body mass index <25 3347 25.01 92 27.96 3439 25.09 0.569
25-29 4519 33.77 105 31.91 4624 33.73  
30-34 1944 14.53 53 16.11 1997 14.57  
> = 35 675 5.04 16 4.86 691 5.04  
Unknown 2895 21.64 63 19.15 2958 21.58  
Breast density (BI-RADS)(2) 1 2969 22.19 50 15.20 3019 22.03 <0.001
2 5378 40.19 102 31.00 5480 39.98  
3 2338 17.47 83 25.23 2421 17.65  
4 2067 15.45 73 22.19 2140 15.63  
Unknown 628 4.69 21 6.38 649 4.73  
No. of biopsies 0 13263 99.13 325 98.78 13588 99.12 0.513
> = 1 117 0.87 4 1.22 121 0.88  
Menopausal status No 747 5.58 18 5.47 765 5.58 0.930
Yes 12633 94.42 311 94.53 12944 94.42  
Affected first-degree relatives No 12647 94.52 302 91.79 12949 94.46 0.195
Yes 704 5.26 26 7.90 730 5.32  
Unknown 29 0.22 1 0.30 30 0.22  
Previous benign breast disease No 12420 92.83 292 88.75 12712 92.73 0.005
  Yes 960 7.17 37 11.25 997 7.27  
  1. (1)Ductal carcinoma in situ cases were included as no cancer cases.
  2. (2)1: Almost entirely fat, 2: Scattered fibroglandular densities, 3: Heterogeneously dense, 4: Extremely dense.
  3. (3)P-values have been obtained excluding the unknown values.