Table 2 Lesion factors associated with false-positive results in screening mammogram.
From: Factors associated with false-positive screening mammography in São Paulo, Brazil
Factors related to lesion¹ | True-positives | False-positives | Multivariate analysis ² |
|---|---|---|---|
N (%) | N (%) | Odds Ratio (95% CI) | |
Type | |||
Calcifications | 365 (8.4) | 2329 (42) | 3.4 (2.9–4.0) |
Solid-Cyst | 1331 (30.5) | 1902 (34.3) | 1.1 (0.8–1.4) |
Cyst | 4 (0.1) | 414 (7.5) | 1.8 (1.0–2.9) |
Solid nodule | 2663 (61) | 899 (16.2) | [Reference] |
Edges | |||
Defined | 371 (17.8) | 1982 (90) | 2.4 (1.9–3.2) |
Undefined | 1719 (82.2) | 219 (10) | [Reference] |
Missing values | 2273 | 3343 | - |
Characteristics | |||
Irregular | 3458 (86.8) | 4192 (85.2) | 0.9 (0.4–1.6) |
Regular | 528 (13.2) | 728 (14.8) | [Reference] |
Missing | 377 | 624 | - |
Size | |||
≤ 10 mm | 1016 (23.3) | 3577 (64.5) | 3.8 (3.4–4.3) |
11–20 mm | 2358 (54) | 1203 (21.7) | 0.5 (0.1–1.6) |
> 20 mm | 989 (22.7) | 764 (13.8) | [Reference] |
Topographic site | |||
Lateral upper quadrant | 1111 (40.4) | 1421 (41.9) | - |
Lateral lower quadrant | 194 (7.1) | 241 (7.1) | - |
Medial upper quadrant | 247 (9) | 328 (9.7) | - |
Medial lower quadrant | 117 (4.3) | 168 (5) | - |
Union of lateral quadrants | 232 (8.4) | 268 (7.9) | - |
Union of upper quadrants | 250 (9.1) | 292 (8.6) | - |
Union of medial quadrants | 86 (3.1) | 135 (4) | - |
Union of lower quadrants | 122 (4.4) | 114 (3.4) | - |
Axillary extension | 113 (4.1) | 114 (3.4) | - |
Retro areolar region | 278 (10.1) | 311 (9.2) | - |
Missing | 1613 | 2152 | |
