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Table 1 Patient, mammographic and tumor characteristics (primary study sample)
| Study sample (n = 1403) | ||||
|---|---|---|---|---|
| 1C (n = 394) n (%) or mean | SC (n = 1009) n (%) or mean | p value | Missing data | |
| PATIENT CHARACTERISTICS | ||||
| Age at diagnosis | 60.8 | 60.2 | 0.055 | 0 % |
| Menopausal at diagnosis | 0.150 | 6.4 % | ||
| Yes | 297 (81 %) | 794 (84 %) | ||
| No | 71 (19 %) | 151 (16 %) | ||
| BMI | 24.8 | 25.8 | <0.001 | 3.2 % |
| HRT use at diagnosis | <0.001 | 5.1 % | ||
| No | 280 (75 %) | 802 (84 %) | ||
| Yes | 93 (25 %) | 156 (16 %) | ||
| Oral contraceptive use | 0.145 | 3.1 % | ||
| No | 78 (21 %) | 239 (24 %) | ||
| Yes | 300 (79 %) | 742 (76 %) | ||
| Parity | ||||
| Nulliparous | 61 (15 %) | 158 (16 %) | 0.997 | 2.2 % |
| Number of births, parous women | 2.13 | 2.14 | 0.816 | 0 % |
| Age at first birth, parous women | 25.7 | 25.4 | 0.341 | 0 % |
| Family history of breast cancer (first degree) | 0.029 | 7.8 % | ||
| No | 284 (77 %) | 762 (82 %) | ||
| Yes | 84 (23 %) | 162 (18 %) | ||
| MAMMOGRAPHIC CHARACTERISTICS | ||||
| Time (months) from measure to diagnosis | 15.3 (median) | 24.6 (median) | <0.001 | |
| Mammographic percent density | 23.5 (median) | 17.6 (median) | <0.001 | |
| TUMOR CHARACTERISTICS | n (%) or mean | n (%) or mean | ||
| Tumor size, mm | 19.5 | 15.6 | <0.001 | 7.3 % |
| Lymph node metastasis | <0.001 | 0.4 % | ||
| No | 356 (91 %) | 960 (96 %) | ||
| Yes | 37 (9 %) | 45 (4 %) | ||
| Tumor grade, Elston | <0.001 | 42 % | ||
| 1 | 35 (16 %) | 147 (25 %) | ||
| 2 | 109 (50 %) | 323 (54 %) | ||
| 3 | 75 (34 %) | 127 (21 %) | ||
| ER status | <0.001 | 27 % | ||
| Negative | 57 (19 %) | 72 (10 %) | ||
| Positive | 239 (81 %) | 659 (90 %) | ||
| PR status | 0.002 | 28 % | ||
| Negative | 109 (38 %) | 201 (28 %) | ||
| Positive | 181 (62 %) | 520 (72 %) | ||
