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Table 1 Characteristics of the study population relative to case and control status

From: Characterizing mammographic images by using generic texture features

Characteristic Cases (n= 864)
Mean (± SD)
or count (%)
Controls (n= 418)
Mean (± SD)
or count (%)
Age at mammogram (years) 57.5 (± 10.8) 57.3 (± 10.6)
BMI (kg/m2) 26.1 (± 5.0) 24.6 (± 3.8)
Age at last menstruation {years} 48.7 (± 5.5) 47.5 (± 6.6)
Age at first menarche (years) 13.5 (± 1.6) 13.4 (± 1.4)
Age at FTP (years) 25.2 (± 4.6) 25.6 (± 4.4)
Menopausal status   
   Premenopausal 221 (30.9%) 105 (26.6%)
   Postmenopausal 495 (69.1%) 209 (73.4%)
Parity   
   No birth 125 (15.5%) 54 (14.3%)
   1 to 2 births 507 (62.7%) 202 (53.4%)
   ≥ 3 births 177 (21.9%) 122 (32.3%)
Family history of breast cancer
   No 700 (85.6%) 237 (80.3%)
   Yes 118 (14.4%) 58 (19.7%)
HRT ever   
   No 564 (70.2%) 156 (42.5%)
   Yes 239 (29.8%) 211 (57.5%)
  1. For the cases, age is identical with age at diagnosis. BMI, body mass index; FTP, first term pregnancy; HRT, hormone replacement therapy.