TABLE 1.
Demographic, clinicopathologic, and treatment characteristics of the study cohort
| Characteristic | N = 16 382 | Liver resection | No liver resection | P‐value |
|---|---|---|---|---|
| n (%) | n (%) | |||
| Age (years) | 18‐55 | 656 (40) | 3487 (24) | <.001 |
| 56‐66 | 525 (32) | 3771 (26) | ||
| 67‐76 | 318 (19) | 3621 (25) | ||
| 77‐103 | 136 (8) | 3868 (26) | ||
| Sex | Male | 870 (53) | 7834 (53) | .946 |
| Female | 765 (47) | 6913 (47) | ||
| Comorbidities | None | 1386 (85) | 10 908 (74) | <.001 |
| One | 210 (13) | 2691 (18) | ||
| Two+ | 39 (2) | 1148 (8) | ||
| Marital status | Not married | 552 (34) | 7076 (48) | <.001 |
| Married | 1083 (66) | 7671 (52) | ||
| Year of diagnosis | 2000‐2003 | 431 (26) | 4850 (33) | <.001 |
| 2004‐2008 | 736 (45) | 5666 (38) | ||
| 2009‐2012 | 468 (29) | 4231 (29) | ||
| Socioeconomic status | Very low | 174 (11) | 2405 (16) | <.001 |
| Low | 248 (15) | 2883 (20) | ||
| Middle | 286 (17) | 3106 (21) | ||
| High | 404 (25) | 3099 (21) | ||
| Very high | 453 (28) | 2682 (18) | ||
| Race/ethnicity | White | 997 (61) | 8667 (59) | <.001 |
| Black | 98 (6) | 1493 (10) | ||
| Hispanic | 257 (16) | 2463 (17) | ||
| Asian/PI | 223 (14) | 1763 (12) | ||
| Middle Eastern | 50 (3) | 268 (2) | ||
| Insurance | Private/PPO | 735 (45) | 5038 (34) | <.001 |
| HMO | 249 (15) | 1669 (11) | ||
| Medicare | 451 (28) | 5660 (38) | ||
| Medicaid/indig | 160 (10) | 2097 (14) | ||
| Federal | 6 (<1) | 37 (<1) | ||
| Distance traveled (miles) | 0‐3 | 342 (21) | 3676 (25) | <.001 |
| 3.1‐5.9 | 372 (23) | 3646 (25) | ||
| 6.0‐11.2 | 417 (26) | 3607 (25) | ||
| >11.3 | 474 (29) | 3537 (24) | ||
| Grade | Low | 68 (4) | 574 (4) | <.001 |
| Moderate | 1164 (71) | 7837 (53) | ||
| Poor | 333 (20) | 3629 (25) | ||
| Undifferentiated | 14 (1) | 222 (1) | ||
| Node positive | No | 582 (36) | 7516 (51) | <.001 |
| Yes | 1053 (64) | 7231 (49) | ||
| Extrahepatic metastases | No | 861 (53) | 6370 (43) | <.001 |
| Yes | 774 (47) | 8377 (57) | ||
| Primary ‐site | Right colon | 569 (35) | 6000 (41) | <.001 |
| Left colon/rectum | 1066 (65) | 8747 (59) | ||
| Primary ‐ resection | No | 58 (3) | 58 (3) | <.001 |
| Yes | 1577 (96) | 9352 (63) | ||
| Chemotherapy | No | 275 (17) | 6613 (45) | <.001 |
| Yes | 1321 (81) | 7566 (51) |