Table 1. Characteristics of patients from SEER database.
| Variables | Total (N=3,264) |
|---|---|
| Sex | |
| Female | 2,228 (68.3%) |
| Male | 1,036 (31.7%) |
| Age (years) | |
| Mean (SD) | 57.5 (15.5) |
| Median [min, max] | 58.0 [11.0, 85.0] |
| Age group (years) | |
| <55 | 1,351 (41.4%) |
| ≥55 | 1,913 (58.6%) |
| Race | |
| Black | 273 (8.4%) |
| Other | 223 (6.8%) |
| White | 2,768 (84.8%) |
| Summary stage | |
| Distant | 132 (4.0%) |
| Localized | 2,749 (84.2%) |
| Regional | 383 (11.7%) |
| Tumor size (mm) | |
| Mean (SD) | 36.6 (23.2) |
| Median [min, max] | 31.5 [0, 420] |
| T stage | |
| T1 | 821 (25.2%) |
| T2 | 1,164 (35.7%) |
| T3 | 1,141 (35.0%) |
| T4 | 138 (4.2%) |
| N stage | |
| N0 | 3,080 (94.4%) |
| N1 | 184 (5.6%) |
| M stage | |
| M0 | 3,174 (97.2%) |
| M1 | 90 (2.8%) |
| AJCC stage | |
| I | 1,328 (40.7%) |
| II | 886 (27.1%) |
| III | 830 (25.4%) |
| IV | 220 (6.7%) |
| Thyroidectomy | |
| No | 41 (1.3%) |
| Yes | 3,223 (98.7%) |
SEER, Surveillance, Epidemiology, and End Results; AJCC, American Joint Committee on Cancer.