Baseline characteristics of patients whose mammographic examinations were included in the study
| Characteristic | No. (%) of patients* n = 1127 |
|---|---|
| Age, yr, mean ± SD† | 58.7 ± 9.2 |
| Body mass index, mean ± SD‡ | 25.4 ± 6.8 |
| Modality§ | |
| Computed radiography | 445 (39.5) |
| Digital radiography | 680 (60.3) |
| Unknown | 2 (0.2) |
| Type of examination | |
| Screening | 880 (78.1) |
| Diagnostic | 244 (21.7) |
| Unknown | 3 (0.3) |
| Breast size (cm) | |
| Small (< 8) | 465 (41.3) |
| Medium (8–14.9) | 588 (52.2) |
| Large (≥ 15) | 67 (5.9) |
| Unknown | 7 (0.6) |
| Breast type | |
| Regular | 955 (84.7) |
| Cosmetic or plastic surgery¶ | 38 (3.4) |
| Partial mastectomy | 68 (6.0) |
| Other surgical scars | 19 (1.7) |
| Combination** | 19 (1.7) |
| Unknown | 28 (2.5) |
| Specific condition | |
| None | 1069 (94.9) |
| Limited mobility (e.g., wheelchair) | 6 (0.5) |
| Shoulder pain | 6 (0.5) |
| Sensitive or very sensitive patient | 7 (0.6) |
| Other | 2 (0.2) |
| Unknown | 37 (3.3) |
| Cutaneous markers | 156 (13.8) |
| Images compared with those from previous examination | 929 (82.4) |
Note: SD = standard deviation.
↵* Unless indicated otherwise.
↵† Data were missing for 8 patients.
↵‡ Data were missing for 231 patients.
↵§ Computed radiography was defined as use of an offline system that uses a cassette-based storage phosphor plate, which is read into a detector to create a digital image. Digital radiography was defined as use of an online system that uses an integrated flat panel detector to read the digital image instantly.
↵¶ Includes reduction mammoplasty and mastopexy.
↵** Includes breast type with cosmetic or plastic surgery, or with partial mastectomy or with other surgical scars or any combination of these.