| | Variable | Total | Radiation (%) | No radiation (%) | value |
| | 21,684 | 14,696 (67.8) | 6,988 (32.3) | | | Age, years | | | | <0.0001 | | <50 | 3,151 | 2,658 (84.4) | 493 (15.7) | | | 50–59 | 4,592 | 3,710 (80.8) | 882 (19.2) | | | 60–69 | 5,266 | 3,968 (75.3) | 1,298 (24.7) | | | 70–79 | 5,450 | 3,279 (60.2) |
2,171 (39.8) | | | >80 |
3,224 |
1,080 (33.5) |
2,144 (66.5) | | | Gender | | | | <0.0001 | | Male | 12,756 | 8,972 (70.3) | 3,784 (29.7) | | | Female | 8,927 | 5,723 (64.1) | 3,204 (35.9) | | | Race | | | | 0.3902 | | White | 18,007 | 12,175 (67.6) | 5,832 (32.4) | | | African-American | 1,545 | 1,048 (67.8) | 497 (32.2) | | | Others/unknown | 2,131 | 1,446 (69.1) | 647 (30.9) | | | Stage | | | | <0.0001 | | II | 9,774 | 6,282 (64.3) | 3,492 (35.7) | | | III | 11,909 | 3,492 (35.7) | 3,496 (29.4) | | | SES index | | | | <0.0001 | | 1 | 4,969 | 3,286 (33.9) | 1,683 (33.9) | | | 2 | 4,468 | 2,953 (66.1) | 1,515 (33.9) | | | 3 | 4,378 | 3,093 (70.7) | 1,285 (29.4) | | | 4 | 3,465 | 2,344 (67.7) | 1,121 (32.4) | | | 5 | 4,403 | 3,019 (68.6) | 1,384 (31.43) | | | Year of diagnosis | | | | <0.0001 | | 1998 | 1,240 | 809 (65.2) | 431 (34.8) | | | 1999 | 1,180 | 789 (66.9) | 391 (33.1) | | | 2000 | 2,387 | 1,568 (65.7) | 819 (34.3) | | | 2001 | 2,422 | 1,541 (63.6) | 881 (36.4) | | | 2002 | 2,430 | 1,541 (63.6) | 826 (34.0) | | | 2003 | 2,375 | 1,563 (65.8) | 812 (34.2) | | | 2004 | 2,296 | 1,565 (65.8) | 731 (31.8) | | | 2005 | 2,459 | 1,710 (69.5) | 749 (30.5) | | | 2006 | 2,370 | 1,703 (71.9) | 667 (28.1) | | | 2007 | 2,524 | 1,843 (73.0) | 681 (27.0) | |
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