Table 1. Patients, tumor and treatment characteristics of participates .
| Mean survival time (day) | |||||
| Characteristics | Patients, n (%) | Deaths, n (%) | Mean | SE | P value |
| Age at diagnosis (yr) | 0.001 | ||||
| <50 | 351 (67.2) | 109 (31.1) | 3330 | 317.0 | |
| ≥50 | 171 (32.8) | 76 (44.4) | 2370 | 160.9 | |
| Marital status | 0.867 | ||||
| Single | 21 (4.0) | 6 (28.6) | 2494 | 255.1 | |
| Married, divorced, widowed | 501 (96.0) | 179 (35.7) | 3128 | 267.9 | |
| Tumor size | 0.001 | ||||
| <2 cm | 324 (62.1) | 91 (28.1) | 4161 | 184.3 | |
| 2-5 cm | 130 (24.9) | 46 (35.4) | 2898 | 201.9 | |
| ≥5 cm | 68 (13.0) | 48 (70.6) | 1889 | 154.1 | |
| Involved lymph node | 0.001 | ||||
| ≤2 | 212 (52.2) | 54 (25.5) | 2817 | 162.7 | |
| 3-6 | 110 (27.1) | 33 (30.0) | 2485 | 110.8 | |
| ≥7 | 84 (20.7) | 43 (51.2) | 2103 | 139.7 | |
| Metastasis status | 0.001 | ||||
| Present | 122 (23.4) | 47 (38.5) | 2581 | 056.5 | |
| Absence | 400 (76.6) | 290 (72.5) | 2368 | 216.5 | |
| AJCC stage a | 0.001 | ||||
| I | 194 (39.5) | 43 (22.2) | 2602 | 076.9 | |
| II | 69 (14.1) | 23 (33.3) | 2520 | 121.9 | |
| III | 107 (21.8) | 36 (33.6) | 2436 | 114.8 | |
| Unknown | 122 (24.6) | 74 (61.2) | 2388 | 218.9 | |
| Type of surgery | 0.843 | ||||
| Breast conserving | 26 (5.0) | 8 (30.8) | 3294 | 353.9 | |
| Lumpectomy | 392 (75.1) | 145 (37.0) | 3011 | 304.4 | |
| Quadrantectomy | 41 (7.9) | 15 (36.6) | 2437 | 198.7 | |
| Total mastectomy | 63 (12.0) | 17 (27.0) | 2336 | 147.2 | |
a American Joint Committee on Cancer stage