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Table 1 Patient characteristics in relation to mammography failure (yes/no)

From: Using automated texture features to determine the probability for masking of a tumor on mammography, but not ultrasound

Characteristic Visible on mammography and US Visible only on US (mammography failure)
Mean or n SD or % Mean or n SD or %
Age 60.2 12.5 52.5 12.1
BMI 26.4 4.7 23.7 3.5
PMD 34.5 18.3 51.3 20.5
Previous breast surgery
 No 1080 87.4 79 80.6
 Yes 156 12.6 19 19.4
Menopausal and HRT status
 Premenopausal 269 21.8 46 46.9
 Postmenopausal and no HRT 721 58.3 28 28.6
 Postmenopausal and HRT 246 19.9 24 24.5
Imaging technique
 Analog 761 61.6 55 56.1
 Digital 475 38.4 43 43.9
  1. Mean and standard deviation (SD) are shown for continuous characteristics, and frequency and percentage for categorical characteristics
  2. BMI body mass index, HRT hormone replacement therapy, PMD percentage mammographic density, US ultrasonography