Table 1.
Demographic and clinical characteristics of the study population.
| Characteristic | Low-Grade Tumor | High-Grade Tumor | P | |
|---|---|---|---|---|
| N(%) | 755 (4.29) | 16,854 (95.71) | ||
| Mean Age [Years (standard deviation)] | 53.6 (±15.34) | 62.3 (±11.66) | <0.001 | |
| Race [N (%)] | 0.1 | |||
| White | 695 (92.1) | 15,186 (90.1) | ||
| African-American | 43 (5.7) | 1,108 (6.6) | ||
| Other | 17 (2.3) | 560 (3.3) | ||
| Year of diagnosis [N (%)] | 0.03 | |||
| 2003–2005 | 268 (35.5) | 5,349 (31.7) | ||
| 2006–2008 | 264 (35.0) | 5,864 (34.8) | ||
| 2009–2011 | 223 (29.5) | 5,641 (33.5) | ||
| Region [N (%)] | <0.001 | |||
| Northeast | 128 (17.0) | 3,023 (17.9) | ||
| Midwest | 201 (26.6) | 4,397 (26.1) | ||
| South | 333 (44.1) | 6,507 (38.6) | ||
| West | 93 (12.3) | 2,927 (17.4) | ||
| Charlson/Deyo Score [N (%)] | 0.3 | |||
| 0 | 630 (83.4) | 14,032 (83.3) | ||
| 1 | 109 (14.4) | 2,320 (13.8) | ||
| 2 | 16 (2.1) | 502 (3.0) | ||
| Stage [N (%)] | <0.001 | |||
| IIIC | 625 (82.8) | 12,454 (73.9) | ||
| IV | 130 (17.2) | 4,400 (26.1) | ||
| Lymph Node Dissection [N (%)] | 509 (67.4) | 9,379 (55.6) | <0.001 | |
| Adjuvant Treatment [N (%)] | 0.01 | |||
| None | 146 (19.3) | 2,776 (16.5) | ||
| Chemotherapy | 603 (80.6) | 14,026 (83.5) | ||
| Radiation | 1 (0.1) | 5 (0.0) | ||
| Chemo-radiation | 5 (0.7) | 47 (0.3) | ||