Table 1.
Characteristics of 83 625 Patients With Colorectal Cancer
| Characteristic | No. (%) |
|---|---|
| PCP visits in previous 3-27 mo | |
| 0 or 1 | 23 206 (27.8) |
| 2-4 | 20 407 (24.4) |
| 5-10 | 19 140 (22.9) |
| ≥11 | 20 872 (25.0) |
| Non-PCP visits in previous 3-27 mo | |
| 0 or 1 | 28 480 (34.1) |
| 2-4 | 17 480 (20.9) |
| 5-10 | 16 998 (20.3) |
| ≥11 | 20 667 (24.7) |
| Receipt of influenza vaccination in previous 3-27 mo | |
| No | 40 996 (49.0) |
| Yes | 42 629 (51.0) |
| Age at diagnosis, y | |
| 67-75 | 40 330 (48.2) |
| 76-85 | 43 295 (51.8) |
| Sex | |
| Male | 39 821 (47.6) |
| Female | 43 804 (52.4) |
| Race/ethnicity | |
| White, non-Hispanic | 69 191 (82.7) |
| Black, non-Hispanic | 6278 (7.5) |
| Hispanic | 3738 (4.5) |
| Asian/American Indian/Pacific Islander | 4268 (5.1) |
| Other | 150 (0.2) |
| Charlson comorbidity index | |
| 0 | 47 541 (56.9) |
| 1 | 19 766 (23.6) |
| ≥2 | 16 318 (19.5) |
| Year of diagnosis | |
| 1994-1997 | 19 429 (23.2) |
| 1998-2000 | 18 605 (22.3) |
| 2001-2005 | 45 591 (54.5) |
| Marital status | |
| Married, including common law | 6295 (7.5) |
| Single, never married | 44 805 (53.6) |
| Separated/divorced | 4931 (5.9) |
| Widowed | 23 998 (28.7) |
| Unknown | 3596 (4.3) |
| MSA of residence (n = 83 623) | |
| Large metropolitan | 46 423 (55.5) |
| Metropolitan | 22 930 (27.4) |
| Urban | 5407 (6.5) |
| Less urban | 7253 (8.7) |
| Unknown | 1610 (1.9) |
| Educational level (n = 80 281) | |
| Quintile 1, lowest | 15 996 (19.9) |
| Quintile 2 | 15 951 (19.9) |
| Quintile 3 | 16 188 (20.2) |
| Quintile 4 | 15 921 (19.8) |
| Quintile 5, highest | 16 225 (20.2) |
| Income level (n = 83 103) | |
| Quintile 1, lowest | 17 224 (20.7) |
| Quintile 2 | 16 591 (20.0) |
| Quintile 3 | 16 448 (19.8) |
| Quintile 4 | 16 562 (19.9) |
| Quintile 5, highest | 16 278 (19.6) |
| SEER registrya | |
| San Francisco, 1973+ | 3615 (4.3) |
| Connecticut, 1973+ | 8085 (9.7) |
| Detroit, 1973 + | 8443 (10.1) |
| Hawaii, 1973+ | 1558 (1.9) |
| Iowa, 1973+ | 8863 (10.6) |
| New Mexico, 1973+ | 2182 (2.6) |
| Seattle, 1974+ | 4912 (5.9) |
| Utah, 1973+ | 2292 (2.7) |
| Atlanta, 1975+ | 2700 (3.2) |
| San Jose, 1988+ | 2164 (2.6) |
| Los Angeles, 1988+ | 7586 (9.1) |
| Rural Georgia, 1992+ | 268 (0.3) |
| Greater California, 2000+ | 9219 (11.0) |
| Kentucky, 2000+ | 5418 (6.5) |
| Louisiana, 2000+ | 4181 (5.0) |
| New Jersey, 2000+ | 11 176 (13.4) |
| Unknown | 963 (1.2) |
| Histologic type | |
| Adenocarcinoma | 82 177 (98.3) |
| Carcinoid | 974 (1.2) |
| Miscellaneous | 474 (0.6) |
| Stage at diagnosis | |
| 0, In situ | 6913 (8.3) |
| I | 18 624 (22.3) |
| II | 23 028 (27.5) |
| III | 18 389 (22.0) |
| IV | 8622 (10.3) |
| Unknown | 8049 (9.6) |
| Tumor grade | |
| Well differentiated | 7650 (9.2) |
| Moderately differentiated | 49 189 (58.8) |
| Poorly differentiated | 13188 (15.8) |
| Undifferentiated | 667 (0.8) |
| Unknown | 12 931 (15.5) |
| Tumor size, mean (SD), cm | 40.2 (25.0) |
| Tumor location | |
| Rectum | 21 512 (25.7) |
| Colon | 62 113 (74.3) |
| Anatomic site | |
| Distal | 45 276 (54.1) |
| Proximal | 38 349 (45.9) |
Abbreviations: MSA, metropolitan statistical area; PCP, primary care physician; SEER, Surveillance, Epidemiology, and End Results.
a
The year with the “+” sign refers to the year when the site became part of the SEER registry (from that date to the present).