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Table 1 Descriptive characteristics of the studies included

From: Identification of two novel mammographic density loci at 6Q25.1

Study Number Mammogram Measure Age (years) BMI (kg/m2) Post-menopause Percent density (%)a Absolute densea Absolute nondensea
     Mean (SD) Mean (SD) Percent (N) Median (IQR) Median (IQR) Median (IQR)
KARMA 4025 Raw digital Volpara 53.6 (9.4) 25.3 (4.2) 51.0 (2,054) 8.4 (6.5) 60.4 (36.8) 677 (581)
SASBAC 1589 Digitized screen-film Cumulus 62.4 (6.4) 25.6 (3.8) 100 (1,589) 11.8 (17.7) 18.1 (26.2) 140 (76)
LIBRO-1 2805 Digitized screen-film ImageJ 58.4 (8.8) 25.3 (4.0) 76.1 (2,134) 30.0 (21.6) 30.6 (21.5) 71 (30)
  1. All mammograms were from the mediolateral oblique (MLO) view
  2. BMI body mass index, SD standard deviation, IQR interquartile range
  3. aPercent density (percent MD) in %; absolute dense tissue (absolute MD) in cm3 (KARMA) and cm2 (SASBAC and LIBRO-1); absolute nondense tissue in cm3 (KARMA) and cm2 (SASBAC and LIBRO-1)