Table 1.
Pre-diagnostic mammographic measures and tumour characteristics among women with breast cancer (n=231)
| Pre-diagnostic mammographic measures | Mean (SD) | |
|---|---|---|
| Age at screen (years) | 42.5 (2.3) | |
| Whole breast | Breast Area (cm2) | 140.4 (51.7) |
| Dense Area (cm2) | 56.4 (25.1) | |
| Percent MD (%) | 42.4 (16.3) | |
| Square-specific (1 cm) |
No. of squares per film | 271 (81) |
| Tumour Characteristics | N (%) | |
|---|---|---|
| Age at diagnosis (years, mean (SD)) | 46.8 (3.1) | |
| Laterality | Left | 116 (50.2) |
| Grade a | 1 | 39 (22.0) |
| 2 | 80 (45.2) | |
| 3 | 58 (32.8) | |
| Whole Tumour diameter (mm, n=129) | 18 (13, 27) b | |
| Non-invasive component present c | 172 (76.2) | |
| of which: | Ductal carcinoma in-situ | 159 (92.4) |
| Lobular carcinoma in-situ | 18 (10.5) | |
| Other in-situ | 1 (0.6) | |
| Maximum diameter (mm, n=42) | 19 (12, 25) b | |
| Invasive component present | 182 (78.8) | |
| of which: | Ductal | 149 (81.9) |
| Lobular | 28 (15.4) | |
| Tubular/cribiform | 14 (7.7) | |
| Medullary, mucoid, other | 7 (3.8) | |
| Maximum diameter (mm, n=164) | 18 (13, 27) b | |
MD = mammographic density
a
54 missing, percentage out of non-missing
b
Median (inter-quartile range)
c
No. of exclusively non-invasive lesions=43; no. of cancers with both invasive and non-invasive components=182; no. with missing information=6. Percentage out of non-missing