Characteristics of available measurement challenge images and data
| Country (where images were sourced) | Study design | No case/controls | Ethnic majority | Mean age (SD) | Mean BMI (SD) | Image type | Mammogram view | Machine manufacturer |
| Australia12 | Nested Case/control | 464/463 | European | 62.9 (7.1) | 27.3 (5.4) | P | CC, MLO | Fuji, Hologic, Siemens |
| Malaysia13 | Case/control | 202/202 | Chinese | 50.9 (11.5) | 23.4 (3.8) | R, P | CC, MLO | Hologic |
| UK14 | Case/control | 403/683 | European | 62.1 (9.8) | 26.2 (5.4) | R, P | CC | GE |
| USA15 | Case/control | 398/398 | European | 55.1 (10.9) | 27.8 (6.3) | R, P | CC, MLO | GE, Hologic |
| Scandinavia11 | Nested Case/control | 183/183 | European | 59.7 (6.2) | 24.7 (3.4) | P | CC, MLO | GE |
| Combined (all data) | 1650/1929 | European | 59.3 (10.2) | 26.2 (5.3) | R, P | CC, MLO | GE, Hologic |
CC, craniocaudal; GE, general electric; MLO, mediolateral-oblique; P, processed image; R, raw image.