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Table 1 Characteristics of 52,814 women undergoing digital mammography (first time) between 2003 and 2011

From: The effect of volumetric breast density on the risk of screen-detected and interval breast cancers: a cohort study

  No breast cancer
(N = 52,291)
Screen-detected cancer
(N = 299)
Interval cancer
(N = 224)
Age (years)a, median (IQR) 56 (51 ; 63) 59 (54 ; 64) 55 (50 ; 62)
Number of screening rounds participated in, median (IQR) 5 (2 ; 8) 7 (4 ; 9) 4 (2 ; 7)
Follow up (years)b, median (IQR) 4.2 (2.0 ; 6.2) 3.8 (2.1 ; 4.3) 2.3 (1.3 ; 4.0)
VDG categories, n (%)
 Category 1 10,458 (20.0) 46 (15.4) 12 (5.4)
 Category 2 21,276 (40.7) 143 (47.8) 72 (32.1)
 Category 3 15,856 (30.3) 89 (29.8) 100 (44.6)
 Category 4 4,701 (9.0) 21 (7.0) 40 (17.9)
Continuous density measures, median (IQR)
 Dense volume (cm3)a 57.7 (42.8 ; 78.8) 63.2 (49.0 ; 83.5) 67.7 (48.9 ; 93.2)
 Percent dense volume (%)a 6.4 (4.8 ; 9.8) 6.5 (5.0 ; 9.4) 8.5 (6.2 ; 13.6)
 Nondense volume (cm3)a 805.0 (518.8 ; 1183.7) 929.1 (585.6 ; 1298.7) 720.3 (469.8 ; 1030.9)
 Total breast volume (cm3)a 866.8 (573.9 ; 1256.8) 994.0 (648.6 ;1376.5) 797.5 (531.8 ; 1105.8)
  1. VDG Volpara density grade
  2. aAt first digital screening mammogram
  3. bWomen were followed until breast cancer diagnosis (event), till death or till 2 years after the last available mammogram, whichever came first