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Table 1 Characteristics of the Aboriginal (n = 499) and non-Aboriginal (n = 493) women with digitized film images

From: The distribution and determinants of mammographic density measures in Western Australian aboriginal women

Characteristics Aboriginal (n = 499) Non-Aboriginal (n = 493)
Mean age at mammogram (SD) 53.6 (8.9) 52.3 (8.5)
HT use in the last 12 months (%) 39 (7.8) 92 (18.7)
Family history of breast cancer (%) 27 (5.4) 40 (8.1)
ARIAa (%)
 Major city 106 (21.2) 129 (26.2)
 Inner and outer regional 100 (20.0) 113 (22.9)
 Remote 98 (19.6) 111 (22.5)
 Very remote 195 (39.1) 140 (28.4)
Advantage and Disadvantage indexb,c (%)
 1 (lowest) 215 (43.1) 124 (25.2)
 2 175 (35.1) 172 (34.9)
 3 82 (16.4) 126 (25.6)
 4 (highest) 27 (5.4) 71 (14.4)
Disadvantage indexb,d (%)
 1 (lowest) 235 (47.1) 131 (26.6)
 2 155 (31.1) 162 (32.9)
 3 86 (17.2) 128 (26.0)
 4 (highest) 23 (4.6) 72 (14.6)
Economic Resources indexb,e (%)
 1 (lowest) 234 (46.9) 132 (26.8)
 2 159 (31.9) 165 (33.5)
 3 77 (15.4) 131 (26.6)
 4 (highest) 29 (5.8) 65 (13.2)
Education and Occupation indexb,f (%)
 1 (lowest) 136 (27.3) 64 (13.0)
 2 226 (45.3) 181 (36.7)
 3 103 (20.6) 156 (31.6)
 4 (highest) 34 (6.8) 92 (18.7)
Mean total breast area in cm2 (SD) 151.0 (46.5) 123.2 (44.9)
Mean non-dense area in cm2 (SD) 138.1 (50.2) 98.4 (49.6)
Mean absolute dense area in cm2 (SD) 12.9 (17.2) 24.8 (20.0)
Mean square root absolute dense area (SD) 2.9 (2.1) 4.5 (2.1)
Mean percentage dense area in % (SD) 9.7 (12.5) 22.9 (17.8)
Mean square root percentage dense area (SD) 2.5 (1.9) 4.3 (2.1)
  1. SD standard deviation, HT hormone therapy
  2. aAccessibility/Remoteness Index of Australia (ARIA) scores
  3. bSEIFA scores are on a scale from 1 to 4, where 1 indicates the lowest 10% of the population in the state (least advantaged and most disadvantaged, most disadvantaged, least economic resources and least education and occupation opportunities) and 4 indicates the highest 30% of the population in the state (most advantage and least disadvantaged, least disadvantaged, most economic resources and most education/occupation opportunities)
  4. cIndex of Relative Socio-Economic Advantage and Disadvantage based on Western Australian state rankings
  5. dIndex of Relative Socio-Economic Disadvantage based on Western Australian state rankings
  6. eIndex of Economic Resources based on Western Australian state rankings
  7. fIndex of Education and Occupation based on Western Australian state rankings