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