Table 1.
Patient demographic characteristics in SEER database
| Characteristics | No. | % | |
|---|---|---|---|
| Age, years (N = 2501) | Mean | 44 | |
| SD | 12.7 | ||
| Race (N = 2480) | White | 2049 | 82.62 |
| Black | 144 | 5.81 | |
| Asian | 287 | 11.57 | |
| Marital status (N = 2422) | Single | 478 | 19.74 |
| Married | 1504 | 62.10 | |
| Separated | 37 | 1.53 | |
| Divorced | 267 | 11.02 | |
| Widowed | 136 | 5.62 | |
| Stage (N = 2465) | IA | 838 | 34.00 |
| IB | 1372 | 55.66 | |
| IIA | 104 | 4.22 | |
| IIB | 151 | 6.13 | |
| Lymph node metastasis (N = 2395) | No metastasis | 2190 | 91.44 |
| Regional lymph node | 179 | 7.47 | |
| Aortic/distant lymph node | 26 | 1.09 | |
| Positive lymph node numbers (N = 1814) | 0 | 1616 | 89.08 |
| 1 | 88 | 4.85 | |
| 2 | 43 | 2.37 | |
| 3 | 26 | 1.43 | |
| 4 | 10 | 0.55 | |
| > = 5 | 31 | 1.72 | |
| Resected lymph node numbers (N = 2311) | Mean | 14.3 | |
| SD | 13.6 | ||
| Tumor diameter, mm (N = 1359) | Mean | 23.7 | |
| SD | 40.6 | ||
| Depth of invasion (N = 1359) | Inner 1/3 | 770 | 56.66 |
| Middle 1/3 | 250 | 18.40 | |
| Outer 1/3 | 339 | 24.94 | |
| Differentiation (N = 1942) | Low | 435 | 22.40 |
| Moderate | 752 | 38.72 | |
| High | 755 | 38.88 | |
| Surgery (N = 955) | Local excision | 75 | 7.85 |
| TH | 49 | 5.13 | |
| TH + LND | 65 | 6.81 | |
| TH + BSO | 127 | 13.3 | |
| TH + BSO + LND | 639 | 66.9 |