Table 1.
Treatment Group Comparison
| Radiation, n (%) | |||
|---|---|---|---|
| Covariate | None N = 2583 | Beam Radiation N = 9453 | P Value |
| Age, y | <.001 | ||
| Median | 75 | 74 | |
| Race | .528 | ||
| White | 2321 (90.21) | 8480 (89.78) | |
| Other | 252 (9.79) | 965 (10.22) | |
| Year of diagnosis | <.001 | ||
| 1998 | 120 (4.65) | 656 (6.94) | |
| 1999 | 143 (5.54) | 643 (6.8) | |
| 2000 | 251 (9.72) | 1114 (11.78) | |
| 2001 | 257 (9.95) | 1073 (11.35) | |
| 2002 | 260 (10.07) | 1032 (10.92) | |
| 2003 | 223 (8.63) | 1028 (10.87) | |
| 2004 | 283 (10.96) | 980 (10.37) | |
| 2005 | 344 (13.32) | 956 (10.11) | |
| 2006 | 359 (13.9) | 966 (10.22) | |
| 2007 | 343 (13.28) | 1005 (10.63) | |
| T stage | .015 | ||
| T1a | 341 (13.2) | 1048 (11.09) | |
| T1b | 1002 (38.79) | 3738 (39.54) | |
| T1c | 1205 (46.65) | 4564 (48.28) | |
| T1mic | 35 (1.36) | 103 (1.09) | |
| Tumor size, mm | .142 | ||
| Mean | 10.71 | 10.88 | |
| Median | 10 | 10 | |
| ≤10 | 1378 (53.35) | 4889 (51.72) | .089 |
| >10 | 1205 (46.65) | 4564 (48.28) | |
| Grade | .171 | ||
| Low | 947 (37.55) | 3292 (35.52) | |
| Intermediate | 1235 (48.97) | 4690 (50.61) | |
| High | 340 (13.48) | 1285 (13.87) | |
Bold values are significant.