Table 1.
Patient demographics of resected rectal cancer patients (SEER-17; 1998–2007).
| Variable | Total | Radiation (%) | No radiation (%) | P value |
|---|---|---|---|---|
| N | 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) |