Table 1.
Patients’ characteristics
| Training set | Validation set | P | |
|---|---|---|---|
| Items | n = 501 | n = 1533 | |
| Age (years), mean (SD) | 48.63(9.41) | 49.01(9.51) | 0.439 |
| BMI (Kg/m2), mean (SD) | 25.23(4.87) | 24.05(5.06) | 0.534 |
| Menopause, n (%) | 0.550 | ||
| Yes | 276(55.1) | 821(53.6) | |
| No | 225(44.9) | 712(46.4) | |
| Family history, n (%) | 0.737 | ||
| Yes | 37(7.4) | 142(9.3) | |
| No | 464(92.6) | 1391(90.7) | |
| Blood type, n (%) | 0.981 | ||
| A | 117(23.4) | 361(23.5) | |
| B | 164(32.7) | 495(32.3) | |
| AB | 63(12.6) | 185(12.1) | |
| O | 157(31.3) | 492(32.1) | |
| Tumor site, n (%) | 0.387 | ||
| Right | 233(46.5) | 679(44.3) | |
| Left | 268(53.5) | 854(55.7) | |
| LNP, n (%) | 0.800 | ||
| Positive | 326(65.1) | 1007(65.7) | |
| Negative | 175(34.9) | 526(34.3) | |
| Tumor size, n (%) | 0.093 | ||
| < 30 mm | 181(36.1) | 614(40.1) | |
| 30–50 mm | 219(43.7) | 637(41.6) | |
| > 50 mm | 101(20.2) | 282(18.4) | |
| Histological Grading, n (%) | 0.614 | ||
| Grade I | 110(22.0) | 296(19.3) | |
| Grade II | 333(66.5) | 1080(70.5) | |
| Grade III | 58(11.5) | 157(10.2) | |
| TNM stage, n (%) | 0.614 | ||
| II | 265(52.9) | 771(50.3) | |
| III | 236(47.1) | 762(49.7) |
SD: standard deviation; BMI: body mass index; LNP: lymph node positivity